It isn't really about the "sex", you are a normal healthy person who has a sex drive.
What it is really about is "boundaries", you need to learn how to set healthy boundaries for "you" and when you achieve that, you will decide when "you" want sex and not feeling like you need to because you think that is what someone else wants of you.

You need to take your own body back, it's yours, not someone else's. People have a lot of confusion about this. It isn't the sex, it isn't that you should not have sexual pleasure either, it is about "boundaries" and realizing you don't need to feel shame when it is "your choice" to enjoy your body and your own sexuality. If another person can't respect that then that person is just not worthy of your time. You don't have to give up your boundaries to be loved either.