OP
You deserved a better teenhood than that.
They were saying that if you're attracted to men, you should only have casual sex. How the fuck is that safer for a woman than being in a consensual relationship?
50% of rapes are by a current or former partner and 80% by someone you know. So only ever shagging strangers is safer than serial monogamy. Counter-intuitive, but true. A third of men think it's not rape if they don't stop if asked once sex has begun. I think back to all the times sex with long-term partners has hurt and I haven't said stop, and been made ill by it, and I realise that it was because I didn't want to have them prove to me that they didn't regard "stop" as a valid option, because then I'd face the heartbreak of LTB. In a one night stand, I don't care about losing him and so I have said and will say "stop, you're hurting me" and will use force to resist if he doesn't. By contrast, women seldom punch or kick those they love.
Sex with men puts my health at risk, and arguably it does for most women. Who takes contraception that quadruples her risk of stroke? She does. Who gets post-coital cystitis? She does. Morning after pill? Abortion? All her problem, whilst some men won't even wear a condom without complaining.
If you consider everything I've just said, it's no surprise that some women take the separatist option, in fact I'm rapidly heading that way myself. The problem is that separatism isn't the magic bullet to end patriarchy. Separatism is a partial escape from patriarchy for individual women (much as transitioning to become a transman is) and won't work for woman as a class. First, if we all refused to have sex with men and have kids, men would force us to, either at a grassroots level through abduction and rape (as seen in India where there is a shortage of women) or by getting the govt to do it for them (as seen in Romania with Decree 770, which is what govts do if they perceive a shortfall in births). Second, most women don't want to be separatist, many want kids (remind me where I'm posting again?) and kids in moderation are needed to perpetuate the species.
I would argue that radical feminism needs to centre the needs of mothers, because they can't just go the separatist route, they have kids in tow. The separatists are already in a position of relative safety, we've reduced our rape risk by half and minimised our chances of DV by having no male partner. The women who have kids and live with men need us to fight their corner. Raising children shouldn't be life-threatening, yet many male abusers turn violent for the first time during their victim's pregnancy. We need to look at the roots (this is where "radical" comes from, "radix" meaning "root", we look at root causes not symptoms) of male violence and destroy it. Separatism treats the symptoms of patriarchy for some women but it doesn't get to the root of it for all of us.