bullride
An extremely funny thing to do during sex.

1.Start banging a girl in the ass.
2.Make sure to get a good grip.
3.Lean forward and whisper into her ear:"I have AIDS."
4.Hold on for as long as you can.

The only way it can go wrong is if she turns around and says:"So do I."

heheh
Tom:Okay, what'd you get on the bullride last night?
Rick: Thirteen seconds.
Tom:Haha, I got eighteen. Pay up. 