Well, I agree, not talking about couples who socialise as couples. They're kind of friendships of convenience, and if the couple splits up, you friend's x is not your ''friend''. So in my opinion you're almost always right.
A lot of women swear blind that they have ten male friends and that's nothing to do with how pretty they are.
Some men are a bit thick and will hover in the background for a decade before they meet somebody who they makes them forget.
I've always been average looking, not ugly, attractive but not exceptional, and funnily enough there was no queue of men trying to be my friend. Like you say, if I wasn't interested they disappeared soon enough. A few times I was and something happened.
Even if I joined a motorbike club I'd probably still make friends with the one or two other women and the men would chat to me but they wouldn't be like, taking my number, and socialising outside of the motorbike circle.
I'm not shy, I don't hog the conversation, I can talk to men, I'm friendly with men at work, and was at my last job. I wonder if some women would call that 'friends'. I didn't.