Sex at School

A boy comes home from his first day at junior high school. The father asked, “What happened in school today?”
The boy says, “I learned how to multiply, and I had sex with my English teacher.”
The father beams. “What a milestone! You’re really growing up! We should celebrate. I tell you what, let’s get an ice cream sundae, and then we’ll go buy you that bike you’ve wanted and go for a bike ride together.”
The boy says, “That sounds great, dad; but could we hold off on the bike ride? My ass is sore as hell!”