Is it merely coincidence that a beaver is slang for female genetalia?
https://english.stackexchange.com/questions/18810/how-did-th... (was curious)
I don't think it's too complex, considering various furry animals names have been used. Rabbit (coney/cunny), cat (pussy).
https://english.stackexchange.com/questions/18810/how-did-th... (was curious)