There is a question that needs to be asked here. What's the sex life like for the never married, 40 year old?
The answer is that it depends.
If you're a typical never married, 40 year old White male working in a some white collar job, you're likely a beta male who is a pusssy beggar. Those guys are the type of guys who need to get married to keep a woman around for some mediocre sex life. These guys are essentially rejects of the sexual marketplace despite being solid citizens with decent white collar guys. Most 40 year old White males who are never married white collar workers would be childless males. Some of these guys will get laid by dropping their standards low enough on Tinder/Bumble/Hinge to get an overweight girlfriend. This overweight woman might also be a similarly aged single mom. These guys might also be simping on OnlyFans. Some of these men are paying directly for sex if they make enough money to afford that and they can't get much attention in the conventional sexual marketplace where pusssy is paid for indirectly.
If you're a typical never married, 40 year old Black, Hispanic, or lower class White guy working a manual labor or service sector McJob, you are less likely to be a pusssy beggar, unlike the White male, white collar worker above. You're more likely to have had 1-2 kids out of wedlock previously. You're some deadbeat guy and being a deadbeat guy is good in the sexual marketplace. See image below for a humourous representation of this.
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Most never married, 40 year old women have no problems getting sex. It's more problematic for them to get relationships. A good portion of the never married 40 year old women are White woman careerists. There are also some never married 40 year old women with kids out of wedlock. The childless White woman careerist will likely have her pusssy be more in demand, because she's likely marketing herself out on the swipe apps.