A young couple were making passionate love in the guy's van.....when suddenly the girl, being a bit on the kinky side, yells out "Oh big boy, whip me, whip me!"
The guy, not wanting to pass up this unique opportunity, obviously did not have any whips on hand, but in a flash of inspiration, he opens the window, snaps the antenna off his van and proceeds to whip the girl until they both collapse in sado-masochistic ecstasy.
About a week later, the girl notices that the marks left by the whipping session are starting to fester a bit so she goes to the doctor. The doctor takes one look at the wounds and asks, "Did you get these marks having sex?"
The girl is a little embarrassed but admits that, yes, she did.
Nodding his head knowingly the doctor exclaims, "I thought so, because in all my years of doctoring you've got the worst case of van aerial disease that I've ever seen."