Sort of Funny Joke... Groan...

A young couple was making passionate love in the guy's van when suddenly the girl yelled, "Whip me. Whip me!"
The guy, eager to please, obviously didn't have a whip, but, in a flash of inspiration, opened his window, snapped the radio antenna off his van, and they shared it until they both collapsed in a sadomasochistic ecstasy.
A week later, the girl noticed that the marks left by their lovemaking session were starting to fester, so she asked her doctor to check them out.
The doctor took one look and asked, "Did you get these marks having sex?" Embarrassed, she admitted that she did.
The doctor nodded. "I thought so. In all my years of doctoring... this is the worst case of 'Van Aerial Disease' I've ever seen!"