Sometimes, their hypersexual promiscuity is a form of self harm, which is why they have a tendency to act like whores and then have a "BPD split" where they accuse the man they slept with of rape or something. I theorize that maybe their disgust with the person they slept with, is actually their disgust with themselves, but they're too cognitively dissonant to realize that. Their subconscious doesn't feel good about being treated like a cheap prostitute doing degenerate kinkplay with strangers, but their conscious doesn't recognize that, so they instead blame it on the man they slept with. The harm is real, but they can't recognize they're doing the harm to themselves, because of the "sex positivity" propaganda, so they instead blame whoever they whored themselves out to.