Borderline personality disorder attempts to describe the chaotic behaviors of many men and women, including: self-harm, attempting suicide, having short and intense relationships (often lasting just a few days) followed by hating and seeking revenge against her previous romance, etc.
There is a large overlap between self-identified sluts and those labeled BPD.
What drives "BPD"
This behavior in people labeled BPD is driven by intense fears of abandonment. Their behavior can often come off to others as consciously sociopathic, except that it’s driven by emotions rather than just a cold plotting to achieve personal gain in an effective way; BPD girls are typically sabotaging themselves at the same time that they sabotage those around them. A BPD girl is quite similar to an emo girl, maybe one of them is even a subset of the other, except that BPD is a recognized “psychological disorder” while being emo is just a cultural phenomenon.
BPD girls and mancel
BPD girls can sometimes be a source of sex for men who would otherwise be incel, the problem being that these girls will usually dump their partners and/or cheat on them, and engage in all sorts of other destructive behavior, making them ultimately dangerous and high-drama to have in one’s life.
Incelistan once renamed their forum to, “Nice guys for BPD girls” as a joke for a day. Some women, excited by the prospects of such a forum, complained after the name changed back to “incelistan”.
Men are attracted to BPD in attractive women
After seeing lots of anectodal evidence that men tied, "hot", women, to "crazy", women, an evolutionary psychologist and sociologist named Alyson E Blanchard hypothesized there was more to this story. Her hypothesis was that instead of hot women being crazy, men are attracted to crazy in hot women. After a comprehensive peer-reviewed study on the matter for Personality and Individual Differences Alyson's research team came to the conclusion that men are particularly attracted to borderline traits in good looking women.
She also found that women are attracted to borderline traits in wealthy, but low attractive men.
Arguments about people labeled BPD
Men's advocates such as Paul Elam strongly recommend against men ever dating someone labeled BPD. This advice would likely extend to incels as well. Other notable MRAs chose to work in men’s rights advocacy simply because of experiences with women labeled BPD.
Other people, in a more anti-psychiatric manner, assert BPD is simply run of the mill predatory behaviour. They argue BPD shouldn’t be pathologized in a way that makes the person labeled with the disorder use it as a constant excuse.
Pop psychology often says women with BPD traits tend to seek out nice guys, and the reason they do this is so they get less pushback for what they often know themselves as predatory or emotionally damaging behaviour. Many mancels who have only had 1-2 women interested in them in their entire lives have relayed those women self-admitting to a BPD diagnosis or that the women exhibited BPD traits after getting to know them.
The anti-Gamergate movement arguably had a pro-borderline disorder tinge.
Borderlines and LGBT
According to an article in the American Journal of Psychiatry, half of borderline personality disordered men studied were homosexual.
"[The researchers obtained the sexual histories of 80 patients who met standardized criteria for borderline disorder and found that 17 (21%) of these patients were homosexual, four (5%) were bisexual, and nine (11%) had diagnoses of paraphilias. Ten (53%) of the 19 men with borderline disorder were homosexual, compared with seven (11%) of the 61 women. Homosexuality was 10 times more common among the men and six times more common among the women with borderline personality disorder than in the general population or in a depressed control group."