Very true.
A 'lifestyle' like this is better be kept as fantasy or porn material to goon, because no sane person can lead such life IRL and think it's ok or normal. Aside of it being self-harming, it's degrading and very risky for the health; there's STDs others than HIV which are as much harmful and disguting (syphilis...), and other diseases exchanged through sexual intercourses (skin problems...). Btw that FL never had protected intercourses with all these dudes, showing an even worse state of mind that's very degraded.
Besides, who knows what happens in those 'parties': is rape not rape anymore just because the person willing to endure this says they like to be sexually assaulted?
If someone cut their arm and says they like it, does this make it ok?
The girl you knew was well aware that after falling into that kind of lifestyle, she couldn't go back to the way she was before. Sex can become addiction if people lack boundaries and don't regulate it, so someone who allows themself to live like this is constantly 'drunk on sex' and can't think properly nor behave normally. Along the way, their sexual practices can become so extreme that it reaches a state of morbidity. So some, who were already mentally damaged, can become depressed and wish to eventually catch STDs and be gone. It's not a surprise why so many porn 'stars' die each year... The only difference is that the porn 'stars' are getting paid.
Such sexual life is not only ruining your reputation, but is very destructive in the whole, inside-out.
I knew a guy who looked always healthy, but then within a year he fell gravily ill and now he's so thin it's worrysome.
I've discovered not long ago he went in that kind of clubs (exchangism)

Thought i'd read this because there were so many people with totally different views on this. But honestly, not hot at all and I would say -- probably not BDSM either. There's people like this irl and it's actually really sad to see - they're not interested in actually having sex they're just self harming because they probably have a history of sexual abuse. they're eroticizing their pain + they think they deserve to be treated awfully.
I knew a girl who lived like this and wanted to get HIV and die.