Gavin wanted to have sex with a girl in his office, but she was in a long-term relationship with someone else. One day Gavin got so frustrated that he went up to her and said, "I'll give you a £100 if you let me have sex with you.”
The girl said, "NO!"
Gavin said, "I'll be fast! - I'll throw the money on the floor, you bend down, and I'll be finished by the time you pick it up."
She thought for a moment and said that she would have to consult her boyfriend. She called her boyfriend and told him the story. The boyfriend said, "Ask him for £200, then pick up the money very fast. He won't even be able to get his pants down."
She agreed and accepted Gavin's proposal.
Half an hour went by and the boyfriend was waiting for his girlfriend to call. Finally after 45 minutes the boyfriend called and asked what happened.
"The b*st*rd used ten pence pieces!" she replied.