I want to preface this with most women I know personally have not had ONSs. I also acknowledge that many women haven't had casual sex at all.

If they've had casual sex, it was an ongoing situationship with the same guy she just happens to call up once a month, once a quarter, once a year, etc.. Sometimes said guy isn't even super hot, he's just "right time, right place" and always available on her terms. More importantly she's comfortable with him.

IME, women compartmentalize.

  • LTR Prospects -- These are guys whom she admires and lusts after. She feels tingles for this guy. She wants to marry him. She wants to show him off. She wants to cuddle him 24/7. She'll happily cook and clean and run his bath water in a heartbeat. These are the guys that when she meets them, she doesn't want to hop into bed immediately for fear he'll leave her. These are also the men some women do bed too early and are sad when he doesn't deem her LTR worthy.

  • Casual Fling Prospects -- These guys can inspire lust, but not admiration. She'll fuck him when she's horny, but never when he's horny. She's never compelled to do cutesy things for him, cook for him, brag about him, etc. He's essentially "fuckzoned" or "plated." Sometimes this works out because she's not emotionally invested; and neither is he. Sometimes the guy is really into her and feels 500 Days of Summer'd :(

  • Beta Provider Prospects -- These are the men left over when she doesn't want a Casual Fling Prospect, and all of the great LTR Prospects are gone. This is the man TRP fears being and I don't blame them. (Important to note, LTR Prospect men also have great provider qualities, they just also have the lust part too.) (Also important to note, many women who have never had casual sex end up choosing this option.)

  • Omegas -- These are men she neither admires or lusts, and certainly not both. She's indifferent to them and doesn't register them.

Does this feel familiar ladies?

How do you compartmentalize, if at all?