sexstories.com
Bondage and restriction
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Starting Off the Summer With a Bang by MightBeRealz
«A local slut gets more than she bargained for when she babysits the neighbor kid for the weekend.»
Rated 81.4%, Read 47514 times, Posted Wed 4th of July 2018
Fantasy , BDSM, Bondage and restriction, Hardcore, Job/Place-of-work, Non-consensual sex, Rape, Teen Male/Teen Female -
Amy-Sue: Who Me? by Boez_99
Rated 76.5%, Read 47508 times, Posted Sun 15th of April 2007
Fiction , BDSM, Bondage and restriction, Female exhibitionist, Lesbian, Romance -
Devil's Island CH 2 by snuskhummer11
«This is a long story. The story follows several women from their abduction to their new lives as slaves and beyond.»
Rated 87.9%, Read 47499 times, Posted Fri 27th of July 2018
Fantasy , BDSM, Body modification, Bondage and restriction, Cruelty, Domination/submission, Extreme -
Alien Orgy by eroticeli77
Rated 85.5%, Read 47496 times, Posted Wed 16th of January 2013
Science-Fiction , Alien, Anal, Bi-sexual, Blowjob, Body modification, Bondage and restriction, Coercion, Domination/submission, Female/Female, Group Sex, Hardcore, Incest, Non-consensual sex, Oral Sex, Written by women -
Neighour Caught me by Faz
Rated 63.1%, Read 47467 times, Posted Mon 14th of August 2006
Fiction , Bondage and restriction, Erotica, Rape, Spanking, Teen Male / Female, Torture -
AHS: Grindr - "Eat Your Veggies" by BearCub_95
«Bottom boy becomes dominant top and degrades and punishes his slave»
Rated 88.6%, Read 47424 times, Posted Mon 2nd of November 2015
True Story , Anal, Ass to mouth, BDSM, Blowjob, Bondage and restriction, Cock & ball torture, Cruelty, Discipline, Domination/submission, Extreme, First Time, Gay, Humiliation, Non-consensual sex, Sado-Masochism, Scatology, Torture, Toys, Virginity, Water Sports/Pissing -
Have Hands-- Hilton Head,S.C. by mikemiller63
Rated 94.1%, Read 47400 times, Posted Fri 18th of July 2014
True Story , Anal, BDSM, Bi-sexual, Bondage and restriction, Domination/submission, massage, Young -
Revenge For Chris's Sister (Epilogue to "Another Level of Bromance")_(0) by CharlieBladeRemus
«Don't fuck with the badass family of an innocent girl...»
Rated 85.6%, Read 47397 times, Posted Fri 3rd of July 2015
Fantasm , Anal, Bi-sexual, Blowjob, Bondage and restriction, Coercion, Cruelty, Cum Swallowing, Domination/submission, Drug, Extreme, Female Domination, Gay, Group Sex, Hardcore, Humiliation, Interracial, Male Domination, Male/Teen Female, Non-consensual sex, Oral Sex, Pegging, Rape, Reluctance, Torture, Violence -
My Dear Sweet Slave: Chapter 8 by Sage_of_the_Forlorn_Path
«The harem is complete.»
Rated 93.6%, Read 47343 times, Posted Sun 16th of April 2017
Fantasm , Anal, Ass to mouth, BDSM, Bi-sexual, Blowjob, Bondage and restriction, Consensual Sex, Cum Swallowing, Domination/submission, Erotica, Extreme, Group Sex, Hardcore, Lesbian, Male / Females, Male / Older Female, Male/Teen Female, Males / Females, Oral Sex, Romance, Sado-Masochism, Slavery, Teen, Toys -
Milk of Desire, Book V - Chapter 1 by Efon
Rated 87.6%, Read 47325 times, Posted Wed 15th of July 2015
Fiction , BDSM, Bi-sexual, Bondage and restriction, Cum Swallowing, Domination/submission, Drug, Erotica, Female/Female, First Time, Group Sex, Hardcore, Lesbian, Male / Female Teens, Male / Females, Male / Older Female, Male Domination, Male/Female, Mind Control, Non-consensual sex, Oral Sex, Rape, Slavery, Teen, Threesome, Violence, Virginity, Voyeurism -
Galactic Vendetta Chapter 05 The Enslaved Princess by Hellcat41979
Rated 90.7%, Read 47325 times, Posted Wed 13th of August 2014
Science-Fiction , Anal, BDSM, Blowjob, Body modification, Bondage and restriction, Cruelty, Death, Domination/submission, Exhibitionism, Humiliation, Lesbian, Murder, Non-consensual sex, Prostitution, Rape, Slavery, Virginity, Water Sports/Pissing -
A substitute teacher meets show and tell pets. by Bear66
«A class has pet show and tell day that goes awry.»
Rated 32%, Read 47322 times, Posted Sat 10th of October 2020
Fiction , Anal, Bestiality, Blackmail, Blowjob, Bondage and restriction, Drug, Fisting, Non-consensual sex, Rape, School, Young -
Becoming Submissive part 5 by kcm
Rated 86.8%, Read 47292 times, Posted Sat 5th of November 2011
True Story , Authoritarian, Blackmail, Bondage and restriction, Cruelty, Discipline, Domination/submission, Exhibitionism, Female/Female, Humiliation, Job/Place-of-work, Male/Female, Males / Females, Reluctance, Torture, Toys, Voyeurism, Written by women -
The Business_(0) by OdwickGrimm
Rated 86.7%, Read 47265 times, Posted Sat 25th of June 2011
Fantasm , Bondage and restriction, Cum Swallowing, Discipline, Domination/submission, Fisting, Group Sex, Rape -
Kidnapped woman gives in by Smittenjen
«Kidnapped woman gives in»
Rated 91.9%, Read 47157 times, Posted Sun 26th of March 2017
Fantasm , Anal, Blackmail, Bondage and restriction, Cruelty, Cum Swallowing, Domination/submission, Female / Girl, First Time, Non-consensual sex -
My poor ass by Renata
Rated 71.1%, Read 47115 times, Posted Mon 3rd of May 2004
True Story , Anal, Bondage and restriction, Domination/submission, Reluctance -
Master Harry Part 1 by Kajira
Rated 77.7%, Read 47053 times, Posted Wed 11th of May 2005
Fiction , BDSM, Bondage and restriction, Domination/submission, Fan fiction, Teen Male/Teen Female -
The War of 2020 by M. O'bryan
«A domestic bio-terror attack has thrown America into a ruthless Civil War. With the Nationalist winning states over the United People's Party, Morgan a bi-racial soldier, is tasked with a mission of sabatoge and rescue. ❤VIEWER DISCRETION IS ADVISED❤»
Rated 90.4%, Read 47010 times, Posted Wed 5th of June 2019
Fantasy , Anal, Black, Blowjob, Bondage and restriction, Domination/submission, Erotica, Hardcore, Interracial, Male/Female, Males / Female, Non-consensual sex, Pregnant, Rape, Reluctance, Slavery, Spanking, Threesome, Violence, Written by women -
Forcing the hot kid. by SexualGod989898
Rated 80.8%, Read 46968 times, Posted Fri 15th of November 2013
True Story , Anal, Blowjob, Bondage and restriction, Boy, Boy / Boy, Gay, Oral Sex, School, Teen, Teen Male / Teen Male -
The Forbidden Book by The_Technician
«What would you do if you knew that a book that everyone else thought was mindless pornography was actually a communications handbook?»
Rated 94.9%, Read 46962 times, Posted Sun 11th of September 2016
Science-Fiction , Bondage and restriction, Female solo, Toys -
Me and My Teen Slut (Part 1) by rretep11
Rated 73.7%, Read 46944 times, Posted Mon 18th of February 2013
Fantasy , Anal, BDSM, Bi-sexual, Blowjob, Bondage and restriction, Boys/Teen Female, Cum Swallowing, Female / Girl, Female Domination, Girls domination, Group Sex, Humiliation, Male Domination, Rape, Reluctance, School, Slavery, Young -
Nancy Nertured by
Rated 78%, Read 46921 times, Posted Tue 1st of May 2007
Fiction , Bestiality, Bondage and restriction, First Time, Group Sex, Incest, Spanking -
Her Stalker (Part 1) by sexual-tension
Rated 86.5%, Read 46905 times, Posted Sun 17th of August 2014
Fantasm , Bondage and restriction, Coercion, Drug, Fan fiction, Hardcore, Male Domination, Male/Teen Female, Non-consensual sex, Rape, Reluctance, Slavery, Violence -
House Slut 12 - The Bet by phenylalanine
«During a break in her duties, Tegan reflects on a bet she made with Angus»
Rated 94.7%, Read 46893 times, Posted Mon 22nd of October 2018
Fantasy , Bondage and restriction, Coercion, Exhibitionism, Humiliation, Masturbation -
Hard "role" fucking in the van by A-Nice18x7
Rated 76.3%, Read 46881 times, Posted Wed 14th of May 2008
True Story , Anal, Bondage and restriction, Discipline, Hardcore, Rape, Reluctance -
The 'Incident' by Fuckallmothers
«A son finds out about his mother's promiscuous lifestyle»
Rated 33.8%, Read 46878 times, Posted Mon 20th of April 2020
Fantasm , Authoritarian, BDSM, Bondage and restriction, Cruelty, Death, Discipline, Domination/submission, Extreme, Fisting, Hardcore, Humiliation, Incest, Male / Older Female, Male Domination, Male/Female, Mature, Murder, Non-consensual sex, Rape, Sado-Masochism, Slavery, Snuff, Stockholm Syndrome, Teen Male / Female, Torture, Violence -
KIDNAPPED_(1) by Sexykitty88
Rated 70.9%, Read 46863 times, Posted Thu 14th of April 2011
Fiction , Blowjob, Bondage and restriction, Cum Swallowing, Domination/submission, Humiliation, Lesbian, Male Domination, Older Male / Female, Oral Sex, Rape, Reluctance, Threesome, Torture, Virginity, Young -
Naruto- KoRn Koncert In Konoha: Part 7 by The Perverted Mind
Rated 89.1%, Read 46842 times, Posted Thu 22nd of July 2010
Fiction , Anal, Asian, BDSM, Blowjob, Bondage and restriction, Consensual Sex, Cum Swallowing, Discipline, Domination/submission, Erotica, First Time, Masturbation, Oral Sex, Romance, Slavery, Spanking, Teen, Teen Male / Female, Teen Male/Teen Female, Toys, Virginity -
Timestop: The Train Ride Chapter 6 by SKOLL
«Villain freezes a college girl on a train during the pandemic to give her extreme punishment.»
Rated 90.2%, Read 46806 times, Posted Fri 31st of December 2021
Science-Fiction , Anal, BDSM, Blowjob, Bondage and restriction, Cruelty, Cum Swallowing, Domination/submission, Exhibitionism, Extreme, Fisting, Hardcore, Horror, Humiliation, Male Domination, Male/Female, Male/Teen Female, Mind Control, Non-consensual sex, Oral Sex, Rape, Sado-Masochism, Spanking, Teen, Torture, Violence, Water Sports/Pissing -
A CASH SHORTFALL by Barbiebnympho
«A gambler gets into very a very difficult situation when he and his family are hauled to Mexico so the cartel can attempt to collect his gambling debts using his family.»
Rated 92.3%, Read 46764 times, Posted Fri 23rd of October 2020
Diary , Bondage and restriction, Domination/submission, First Time, Non-consensual sex, Slavery, Wife, Young -
Don't get caught playing with markers by littlesarah4older
Rated 38.2%, Read 46713 times, Posted Mon 16th of February 2009
Fantasm , Bondage and restriction, Female solo, First Time, Rape, Water Sports/Pissing, Young -
Angel’s Initiation - Ch 2 by S. Stevenson
Rated 74.8%, Read 46560 times, Posted Sun 31st of October 2004
Fiction , Blowjob, Bondage and restriction, Domination/submission, Female/Female, Toys -
Surprise Birthday Party_(0) by bongmonstar
Rated 63.4%, Read 46542 times, Posted Tue 2nd of July 2013
Fantasm , Anal, Blackmail, Blowjob, Bondage and restriction, Cheating, Cuckold, Domination/submission, First Time, Humiliation, Incest, Non-consensual sex, Teen, Toys, Wife -
Becoming a sex slave after the concert gang-bang by Paul Bras
«Jane gets blackmailed into having sex, is tricked and forced to become a sex slave»
Rated 85.1%, Read 46533 times, Posted Tue 19th of February 2019
Fiction , Anal, Ass to mouth, Blackmail, Bondage and restriction, Coercion, Domination/submission, Hardcore, Males / Female, Non-consensual sex, Rape -
Teacher and Student by jessereynolds469
«A teacher gives one of her students unlimited access to herself.»
Rated 93.6%, Read 46470 times, Posted Mon 14th of September 2020
Fiction , Anal, Bondage and restriction, Job/Place-of-work, Teen Male / Female, Toys, Water Sports/Pissing -
Country Fun by the author
Rated 84.6%, Read 46394 times, Posted Sun 13th of November 2005
Fiction , Blowjob, Bondage and restriction, Consensual Sex, Teen Male/Teen Female -
Late Evening Jog Part One (Revised) by UncleRadu
Rated 80.9%, Read 46365 times, Posted Fri 20th of July 2012
Fantasm , Blowjob, Bondage and restriction, Lactation, Non-consensual sex, Rape -
BB Part 1 by Erotic Story Commissions
Rated 80.3%, Read 46356 times, Posted Mon 24th of December 2012
Fantasm , Blackmail, Blowjob, Bondage and restriction, Boys/Teen Female, Coercion, Cruelty, Discipline, Erotica, Extreme, Female exhibitionist, Foot or shoe fetish, Hardcore, Horror, Humiliation, Job/Place-of-work, Latina, Male / Female Teens, Male / Females, Non-consensual sex, Oral Sex, Prostitution, Rape, Reluctance, Sado-Masochism, School, Slavery, Teen Male / Female, Torture, Violence, Voyeurism, Written by women -
Submissive Incest Mind Control Chapter 5: Daughter's Sexy New Jewelry by mypenname3000
«Bess uses her mind contorl powers so her daddy can her her nipples and clit pierced, proving who owns her!»
Rated 91.2%, Read 46290 times, Posted Sun 18th of March 2018
Fiction , Anal, BDSM, Blowjob, Bondage and restriction, Cum Swallowing, Domination/submission, Exhibitionism, Female exhibitionist, Female/Female, Interracial, Male / Females, Male/Female, Sado-Masochism, Threesome, Toys -
The Punching Bag by marxlaten
«Sophie has a fight with her husband. She decides she needs to be punished and used by a stranger.»
Rated 94.7%, Read 46287 times, Posted Mon 27th of December 2021
Fiction , Bondage and restriction, Cheating, Domination/submission, Erotica, Extreme, Male/Female, Masturbation, Sado-Masochism, Violence -
Railed on a train by sandstorm3636
«Jenna was using the bathroom on a train when James decided she should be filling her holes and not emptying them.»
Rated 64.2%, Read 46263 times, Posted Thu 9th of November 2023
Fiction , Anal, Ass to pussy, Authoritarian, Blowjob, Bondage and restriction, Coercion, Consensual Sex, Cruelty, Cum Swallowing, Discipline, Domination/submission, Enema, Extreme, Humiliation, Masturbation, Non-consensual sex, Rape, Reluctance, School, Toys, Young -
The Misfortunes of Twinks I: Part 4 - A Neighbor's Sweet Revenge by ArthurWilde
Rated 86.8%, Read 46215 times, Posted Sat 18th of May 2013
Fiction , Anal, Blackmail, Blowjob, Bondage and restriction, Cock & ball torture, Cum Swallowing, Domination/submission, Gay, Humiliation, Interracial, Masturbation, Non-consensual sex, Oral Sex, Rape, Teen, Torture, Violence -
Impregnating My Girlfriend Part I by RomanceWriter
Rated 68.2%, Read 46197 times, Posted Sun 30th of January 2011
Fiction , Anal, Bondage and restriction, Cum Swallowing, Hardcore, massage, Masturbation, Oral Sex, Pregnant, Romance, Spanking, Teen, Teen Male/Teen Female, Virginity -
First Night in Hell Part 3 by Lady Rogue
Rated 87.4%, Read 46167 times, Posted Thu 16th of April 2009
Fantasm , Anal, Bondage and restriction, Domination/submission, Humiliation, Male / Females, Non-consensual sex, Oral Sex, Rape, Reluctance, Toys -
The English teacher Gets Banged by usedmattter
«An unfulfilled English teacher is asked to step in and chaperone the football team.»
Rated 92.9%, Read 46089 times, Posted Fri 18th of December 2020
Fiction , Blowjob, Bondage and restriction, Domination/submission, Drug, Group Sex, School, Teen Male / Female -
Behind The Castle Doors by Tinnie
Rated 86.7%, Read 46077 times, Posted Thu 31st of January 2013
Fiction , Bondage and restriction, Domination/submission, Drug, First Time, Male / Female Teens, Male/Teen Female, Oral Sex, Rape, Reluctance, Romance, Teen, Teen Male/Teen Female, Teen Male/Teen Females, Torture, Violence, Virginity, Written by women, Young -
A Weekend With Austin_(0) by Breezy Bear
«I stayed with my cousin for the weekend and what happened was anything but a family reunion»
Rated 92%, Read 46059 times, Posted Sun 5th of February 2017
True Story , BDSM, Bondage and restriction, Domination/submission, First Time, Incest, Spanking, Teen, Teen Male/Teen Female, Virginity, Written by women, Young -
Taking Her - Chapter 6 by Master-Twain
Rated 86.4%, Read 46053 times, Posted Sat 16th of June 2012
Fantasm , BDSM, Blowjob, Bondage and restriction, Cruelty, Discipline, Domination/submission, Humiliation, Male / Females, Male Domination, Sado-Masochism, Torture -
My ultimate fantasy by kinkmale
Rated 73.6%, Read 46011 times, Posted Sat 9th of June 2012
True Story , Anal, Ass to mouth, BDSM, Bondage and restriction, Cuckold, Cum Swallowing, Group Sex, Hardcore, Humiliation, Incest, Interracial, Lesbian, Oral Sex, Torture, Toys, Water Sports/Pissing -
My wife made the mistake of telling one of her girlfriends that we had a great sex life by
Rated 84.7%, Read 45984 times, Posted Tue 9th of July 2013
True Story , BDSM, Bondage and restriction, Cheating, Consensual Sex, First Time, Oral Sex, Wife -
Lilith's Hell - Part 1 by cummDump
«A group of wealthy, influential men have paid good money for the chance to use a young woman's body however they see fit.»
Rated 91.1%, Read 45984 times, Posted Wed 21st of October 2020
Fiction , Anal, Ass to mouth, BDSM, Blowjob, Bondage and restriction, Cruelty, Cum Swallowing, Group Sex, Hardcore, Non-consensual sex, Oral Sex, Rape, Written by women -
Mountain Retreat by S. Stevenson
Rated 75.9%, Read 45978 times, Posted Fri 24th of September 2004
Fiction , Blowjob, Bondage and restriction, Domination/submission, Exhibitionism, Male/Female, Toys -
Unnamed - Act 1, Scene 1 by tyhm
Rated 88%, Read 45948 times, Posted Sun 20th of December 2009
Fantasm , Authoritarian, BDSM, Blowjob, Bondage and restriction, Cruelty, Discipline, Domination/submission, Erotica, Male/Female, Oral Sex, Sado-Masochism, Slavery, Spanking, Stockholm Syndrome, Torture, Toys -
Reading Allowed, Pt.2 by zenmackie
Rated 93.9%, Read 45939 times, Posted Mon 7th of September 2009
Fiction , BDSM, Bondage and restriction, Consensual Sex, Domination/submission, Humiliation, Male/Female -
Reading Allowed, Pt.4 by zenmackie
Rated 91.1%, Read 45888 times, Posted Mon 7th of September 2009
Fiction , BDSM, Bondage and restriction, Consensual Sex, Cruelty, Discipline, Domination/submission, Erotica, Humiliation, Male/Female, Spanking -
Chili, Booze, Nightmares, and the Girl Next Door by JackassTales
Rated 87.6%, Read 45885 times, Posted Sat 6th of October 2012
Fantasm , Bondage and restriction, Coercion, Consensual Sex, Cruelty, Horror, Non-consensual sex, Rape, Romance -
How I made my daughter my submissive Sex Slave (re-wrte by Sir Zell
«How my daughter became my Submissive Sex Slave on her 19th Birthday»
Rated 76.2%, Read 45882 times, Posted Wed 2nd of January 2019
Diary , BDSM, Bondage and restriction, Domination/submission, Incest -
Anal Pleasures - Chapter 2 by Story Teller 101
«A continuing story of my introduction to anal sex»
Rated 91.3%, Read 45843 times, Posted Thu 21st of May 2020
True Story , Anal, Asian, Bondage and restriction, Pegging, Threesome, Transsexual -
Kylie's Song - Part 2 by gaggedKitty23
«Forbidden fantasy brings Kylie and Shauna closer together.»
Rated 94.1%, Read 45825 times, Posted Sat 18th of March 2017
Fiction , Blowjob, Bondage and restriction, Coercion, Domination/submission, Oral Sex, Rape, Reluctance, Toys -
The Kidnap Of Our New Slaves by Ascarthiamei
Rated 87.2%, Read 45684 times, Posted Wed 5th of August 2015
Fantasm , Bondage and restriction, Domination/submission, Non-consensual sex, Non-Erotic, Rape, Reluctance, Slavery, Stockholm Syndrome, Written by women -
Babysitter has an orgasm. by Bear66
«Disabled teen enjoys sex with his sitters.»
Rated 33%, Read 45669 times, Posted Sat 3rd of April 2021
Fiction , Anal, Bestiality, Bondage and restriction, Domination/submission, First Time, Male / Female Teens, Non-consensual sex, Rape, Virginity, Young -
A CASH SHORTFALL 2 by Barbiebnympho
«I am deep in debt to a Mexican cartel. El Capo has kidnapped me and my family and is now collecting what I owe.»
Rated 92.4%, Read 45666 times, Posted Sun 25th of October 2020
Diary , Blackmail, Bondage and restriction, Domination/submission, Humiliation, Male / Female Teens, Non-consensual sex, Virginity, Young -
Most glorious night of my life. by Lee Browning
Rated 73.1%, Read 45648 times, Posted Sun 22nd of December 2013
True Story , Anal, BDSM, Blowjob, Bondage and restriction, Cruelty, Cuckold, Drug, Extreme, Fisting, Males / Female, Rape, Violence, Water Sports/Pissing -
Happy Mothers Day! - Bobby's Bitch by bigbob1200
Rated 77.8%, Read 45642 times, Posted Fri 31st of May 2013
Fantasm , BDSM, Blowjob, Bondage and restriction, Cruelty, Extreme, Humiliation, Latina, Males / Female, Older Female / Males, Rape, Violence -
Sharing My Wife Amanda Chapter 4 by Syzoth
«Amanda has a secret rendezvous at the gym with the huge cock she's been craving, and pays for it in a most unexpected way...»
Rated 92.7%, Read 45624 times, Posted Mon 23rd of July 2018
Diary , Blackmail, Blowjob, Bondage and restriction, Cuckold, Cum Swallowing, Exhibitionism, Male/Female, Oral Sex, Voyeurism -
Devil's Island CH 7 by snuskhummer11
«This is a long story. The story follows several women from their abduction to their new lives as slaves and beyond.»
Rated 93.8%, Read 45567 times, Posted Fri 27th of July 2018
Fantasy , BDSM, Bestiality, Body modification, Bondage and restriction, Cruelty, Extreme -
Debt and its high price part 3 : A walk down memory lane by Illianna
Rated 88.8%, Read 45549 times, Posted Mon 31st of May 2010
Fiction , Anal, BDSM, Blackmail, Bondage and restriction, Extreme, Humiliation, Male/Female, Non-consensual sex, Rape, Slavery, Torture -
Enslaved By Sorority Sluts - Chapter 1 - Captured & Gimped by [James Bondage]
«A grad student seeks to lose his virginity and ends up losing a whole lot more.»
Rated 83.9%, Read 45543 times, Posted Fri 13th of March 2020
Fiction , Anal, Authoritarian, BDSM, Blackmail, Bondage and restriction, Cruelty, Cum Swallowing, Discipline, Domination/submission, Extreme, Female Domination, First Time, Hardcore, Humiliation, Latex fetish, Non-consensual sex, Oral Sex, Pegging, Rape, Slavery, Spanking, Threesome, Toys, Virginity -
Carrie's Training by masterkid
Rated 78.9%, Read 45480 times, Posted Sun 3rd of November 2013
Fantasm , Anal, Bondage and restriction, Extreme, Humiliation, Rape, Slavery, Torture -
Lets Dance by Shadow Lynn parker
Rated 76.9%, Read 45411 times, Posted Mon 7th of February 2005
True Story , Bondage and restriction, Cheating, Exhibitionism, Female exhibitionist, Group Sex, Masturbation