"sex with my teacher" joke

A 13 year-old boy comes home from school and his mom asks how
his day was. He replies, "I had sex with my teacher today."
"Oh my god! You get to your room! Wait till your father comes
home!!!", says the mom.
while later the father comes home and the mom says, "Go up
to your son's room and talk to him. He's been really bad today."
Dad goes up to the son's room and asks why mom is so mad.
"I told her I had sex with my teacher today," replied the boy.
All right That's my boy!", says dad. "Ya know son, women just
don't think like men. But I'm proud of you. What are you now,
about thirteen, right? Wow. That's my son! Ya know what? I'm so
proud of you I'm gonna take you out and buy you that new shiny
bike you've been wanting!"
So the dad and his son go out and buy the nicest, reddest,
shiniest bike in the whole town. "You gonna ride it home son?"
asks dad. The boy replied, "Nah, my ass is still sore."