Hahaha, I feel your pain when it comes to vocabulary with this stuff - its one of the reasons why I don't write a lot of citrussy stuff anymore. I have to be in a mood to write it just as much as to read it, because yeah. It is sort of embarrassing, no? :)

I chicken out more than you when it comes to the euphemisms - I try to stay away from purple prose, but tend to get really, really vague, too. I'm all about context clues, LOL. IDK, it helps that I've read a ton of (good!) sex scenes in romance novels, so I kinda have a roadmap to follow...