1 day after school...
son : mum, i had sex with a teacher
mum : you get back into your room, tell your dad what happen when
he comes home.
dad : i'm home!
mum : look at what your son did
son : dad, i had sex with a teacher
dad : oh boy, you have grown up! now i will buy your favourite bike
for you!
the next day dad brought the bike to school.
son : dad, i had sex with my teacher again.
dad : oh yeah! lets go for a ride, you have really grown up!
son : but dad, i'm hurt in the ass!
copied this joke from somewhere...