My children use proper terms, although Jasper has picked up weiner for his lately. My mom called mine a foo-foo, and it was just plain weird. I did call Jasper's a bumble bee for a bit, but stopped that as I was worried about what he would think if he heard someone being stung by a bumble bee. I don't think of the proper terms as dirty or naughty. Your elbow is an elbow, and your penis is a penis and your vagina is a vagina. Vulva I hate...but, it is a correct term, so I will use it, if it comes up. I do call Jasper's scrotum, nuts....hubby hates that and thinks they should be called testicles. I just think nuts is an easier word to say. lol