Parents.
When she pulls out her tampon the cotton is already picked
Parent: "Wh-" Me: "Moo!"
Dad: "Can I see your report card, son?" Son: "I don't have it." Dad: "Why?" Son: "I gave it to my friend. He wanted to scare his parents."
Partial arts.
In the prayground!
Depends on which method you try....
Oz Moses.
Because with a sausage, a couple of eggs, and some cream, a man can keep a woman full for 9 months.
Because some relationships don't work out.
Contraception.