A young couple were making passionate love in the guy's van (you know,
shagcarpets, 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............
...
...
Wait for it...
...
...
Are you ready....
...
...
Here comes the punchline....
...
...
You've got the worst case of van aerial disease that I've ever seen."