Heads!

After the first week of sex education class, a young shapely teen stormed out of the room after the class was over.

Encountering a female friend in the hall, the friend asked, "Lori, what in the world is the matter with you ? You look as if you're about to kill someone."

"I am !!!" Lori fumed. "You just wait until I catch up with that Dennis. All summer long, that clown had me convinced that 'foreplay' involved tossing a coin for position."