I feel uncomfortable about the fact she asked you about your sex life before you even mentioned it. That seems inappropriate to me, although perhaps your T comes from another modality or type of therapy that believes in getting information from clients. I know that if my T suddenly asked me about sex and mentioned foreplay I would be horrified and just shut down. I will bring up sex in my own time and way. If you're not comfortable discussing sex with this T, it's perfectly okay to let her know.