It crass to talk about sex in public.
Paul is at a McDonald's with his friend Daryl the day after going on a date, and they're sitting near a child named Trevor eating a Happy Meal.
Paul wants to tell Daryl about the sex he had with his date last night.
Paul waits until he and Daryl are driving home to tell him about the adventurous coitus he and his date had the previous night.
Paul describes in a high level of detail the adventurous sexual intercourse he engaged in with his date the previous night.
Trevor goes to school the next day and tells his friends about the toy he got in his Happy Meal at McDonald's.
Trevor goes to school the next day and gets in trouble when he's heard by his teacher retelling Paul's sex story.