A tricky language problem

So! You're in an intimate situation and you get to that fearful point: the point where you want to say something about a part of the body, or an action of the body, but all the words are

A) silly

B) terrifying, or

C) just anything else - why do these words not sound wonderful? Who knows!

The point being, what are the terms that you do and do not like to use? And why?

Feel free to be perfectly serious, or let loose and be a little silly. This is Moonbeam Cafe after all!

This is a NSFW question for a reason! Anonymous replies encouraged, but please don't harass anyone or abuse the anonymity!