A guy claims he can make love to 50 women in 2 hours nonstop. His friends do not believe him, so they set up a bet so see if it's true.

The day of the challenge, he does ok with he first 10 ladies. however, he slows down after 20, and finally stops at the 39th.

Losing the bet and very upset, he blurts out, "I don't understand, I did well in practice just an hour ago!"