Excellent remark, here's the explanation : penis is the correct word for male sex, male word. "Bite" is a very familiar word, female word. "Zob" (from arabic) is male. "Braquemard", (some kind of a knife in the Middle Age) is male. Well, male, female words is very complicated in the french language. Only a few french people are able to use french horrific grammar. Thank you for endeavour!