I Don't Know What I'm Doing, but I Did.

Dr Adrian Proust sent his son to a brothel when he was 16. The doctor thought that masturbation could lead to homosexuality, and gave him ten francs for it. But the boy couldn't have had sex with one of the prostitutes because there were no chickens involved. He then wrote an apology letter to Dr Proust's grandfather asking if he could borrow 13 francs so he could get rid of his masturbatory habit.