How to be a Sex Writing Strumpet - I love this little book.
I know I get repetitive. I pick up on a word and won't let it go. I wish there was a sexy thesaurus because I would totally have that cracked open on my desk all the time.
However, worry about that in editing. Just get the first draft done and then you can go back and add the little details that turn up the heat and swap in some titillating words.