Fred and Fiona were making passionate love in Fred's Transit panel van when
suddenly Fiona (being a bit on the kinky side) yells out:
"Oh fat boy, whip me, whip me!"
Fred, not wanting to pass up this unique opportunity, obviously did not have
Any whips to hand, but in a flash of inspiration, opened the window, snaps
the radio-aerial off his van and proceeds to whip Fiona with it until they both
collapse in sado-masochistic ecstasy.

About a week later, Fiona notices that the marks left by the whipping
session are not healing and 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?"
Fiona, more than a little embarrassed that she had even slept with Fred - let
alone allowed him to indulge in her own kinky desires - eventually admits,
"Yes, I did."
Nodding his head knowingly, the doctor exclaims:
"I thought so. Because, in all my years as a doctor, you've got the worst
case of van aerial disease that I've ever seen.