A boy came home from his first day at school and his dad asked him how things went.
"Interesting day today, I had sex with the Geography teacher"
The father was delighted at the news, "Whahay!, thats my boy., You're a real chip off the old block. Let's go to the bike shop and I'll buy that new bike you've been drooling over"
The boy says "I'll give the bike a miss if it's alright with you, my arse is still sore"