Do your research
Everybody has some sexual words that make them 'squick' (cringe) as we say in Kinkland. Ideally you need to find out hers before you open your filthy mouth. Do a little investigation. What words does she use herself to refer to her own body, yours or other people’s? If in doubt about her lubricious language preferences, next time you’re getting it on play the plausible deniability card: “If I said you had a [insert explicit complement] would you still fuck me?” is a good one. If she blushes it doesn’t necessarily mean she’s not aroused, but her body will tell the truth. Does she grind in to you? Kiss you harder? Feel wetter? If not, leave it, and try another phrase another time.