And how in fuck are you supposed to figure that out? Send them to a shrink first and get a work up? You said you don't date that kind, so that means you have a clear way of weeding out who is or isn't that kind of girl before you even get to that first date..
No. I said don't MARRY a person you don't know. This kind of shit should be known before you get married. That is the purpose of dating, to figure out what kind of person they are. If I date a girl, and it turns out that I think she is untrustworthy, then I won't go further with her. If I think she's a girl that is inexperienced, or incapable of having platonic male friends, then we're going to have that conversation. But I don't say straight up that all mixed gender friendships are impossible.
What a lot of people end up doing, is get involved with people without exploring these issues. Or, after they get married, they get lazy, stop putting energy into the relationship, energy into themselves, and into their partners, and then their partners, or they, start looking for other people.
If you're 28 years old, your husband stops giving a shit about his appearance, has nothing of interest to talk about because he just watches football games in his free time ...welp...guess what's likely to happen when a new guy comes along?
And if you do marry a person that changes, then you either need to get to the bottom of the issue, or don't stay in the relationship.
I don't know why we praise people for suffering together. If the relationship is broke, it's broke. There should be no shame in divorce.
And again, not EVERY person is capable, or ready for an opposite gender friend. If you're a person that can only think about fucking when you're with a girl, female friendships are not for you. But it's not because of some biological lock on your brain that you can't override.
You CAN have real opposite sex friendships if you put the effort into it, and stop thinking like a cave man.