She will go on and on for hours in the house about how terrible I am but at the end of the night just try and hug and kiss me while I am pushing her to get off.
Back in college (over 20 years ago) I went over my first BPD girlfriend's place to break up. The situation had gotten way too out of control and she was taking increasing steps to isolate me and prevent me from doing the things that were really important to me.
She was apparently anticipating the break up. When I got there, she was wearing only a short kimono. She threatened suicide. When that did not work, she tried "Please let's make love one last time" and began licking my ears--something she knew was one of my weaknesses.
It was hard, but fortunately I had the determination to NOT have sex "one last time." Partially, this was because I knew that "one last time" would end up getting back together--she would guilt trip me that I had somehow taken advantage of her when she was vulnerable and therefore needed to take responsibility and resume my role as her enabler.
But there was another important part, and you may have something similar to draw on. While some aspects of the sex were incredible, she frequently picked fights in the middle of sex. The thought of having her explode at me during sex once again was enough to convince me I did not want to give in. (The two items are related of course. There was a good chance that she would interrupt the "one last time" with a guilt trip fight that was designed to make me stay.)
Also keep in mind that sex under coercion ("make love or I will hurt/kill myself" or just continuing to pressure you until you give in as you describe) is RAPE, no matter the genders involved.