street, clinical, or cutesy language. My W has no trouble saying "sex." I put "passion" in quotes, because she would see a man using that word as a euphemism for "sex." There is so much more to passion than just sex.
I don't know what language my W would prefer. She has told me that she will almost always say "no" if I come outright and ask if she'd like to ML, or like to fool around, or anything I come out and ask. On those infrequent times when we do ML, it is not talked about...I just start touching her.