A young couple were making passionate love in the guy's van (you know, shag carpets, big double mattress in the back...all that) 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 to hand, but in a flash of inspiration, he opens the window, snaps the aerial off his van and proceeds to whip the girl until they both collapse in sadomasochistic 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."