What I find really fascinating about these threads is the way so many people operate on the assumption that everyone is the same (or all women are one way, all men are another is a variation on this theme).
I mentioned before the cultural view that men have a need for sex whereas women don't, and women are responsible for fulfilling straight men's sex need and/or fulfilling that need is a reasonable trade for the "things women want" in a relationship (security, intimacy etc), either by being good little wives/girlfriends and ensuring that their husbands are getting their needs met, otherwise they only have themselves to blame when he goes off and has an affair, and/or that it's "cruel" to "enforce celibacy" on someone, and at the worst end (not seen in this thread thankfully) that sexual assault is excusable because what is a man supposed to do???? Or by not leading men on if they don't intend to provide sex (etc).
But the other themes being - nobody needs sex, why would anyone even want sex, total waste of time, don't understand why men are so obsessed with it, and this vague sense of horror/distaste that almost comes across as judgemental to anyone who does say it's important to them. I tend to assume, I might be wrong, but I think this most likely comes from a situation where someone (usually straight female) has had a sex drive anywhere from lower than average to asexual, but has been so relentlessly pestered with variations on Cultural View by men in their lives who have taken their low sex drive as "women don't really like sex anyway, you have to cajole them" rather than "Oh this person isn't that into sex, well never mind then" that they are so totally fed up of the whole thing and are so relieved that they have finally reached a point in their life when they actually say no, I don't want to, no more, and assume everyone is probably just having sex for the vague sense of "you should be doing this" and would feel the same sense of relief if they could give up the charade.
Or the one where someone does consider sex (whether physical or intimacy or connection or however they define it) to be a need separate from other needs, and they make the assumption that women who say/think they don't need or want sex are probably just deluded/bitter, have never had an orgasm, have been traumatised, have never had good sex and feel sorry for them 
I just find it so weird when people are so very convinced that everyone else must be like them and if they think otherwise then they are just mistaken. Most people are aware that introverts and extroverts exist, why wouldn't that be the same for sex? I remember during lockdown my DH was working from home, hadn't seen anyone except us and supermarket cashiers for about 9 months at a time, he was happy as a clam, didn't bother him at all, whereas I was going stir crazy and really struggling with my emotional reaction to not seeing people after a couple of months of being told I had to stop work. I get very weird and intense when I don't have social contact. It is absolutely something I need for my mental health to function. DH went out to some work thing last night and he had a good time, enjoyed himself - but he won't voluntarily do it again for a while.