I must say I find this term ridiculous. I have read this thread with some amazement, never having heard of it before. Sexual attraction that develops only after you get to know somebody has been perfectly normal, and even thought to be the ideal, for centuries, especially among women. It’s been a truism for most of my adult life that women are not simply turned on like a switch but often need a long time to decide if they want you as a sexual partner. Giving it a label that suggests a form of sexual deficiency strikes me as narrow-minded, shallow and a bit offensive to many people. (Not that I’m accusing you of that: I’m talking about the concept you are describing.)
This terminology seems to want to frogmarch perfectly normal people, especially women who have natural sexual hesitancy, into unwanted promiscuity or else stigmatise them as weird or different.
I should say I speak as a 69yr old man who had 12 sexual partners, over the best part of 3 decades, before meeting my wife. (We got married when I was 47, in 2001). I think I was in bed after a couple of weeks with 3 of them. With the others it took quite a bit longer while we sussed one another out. The sexual attraction was by no means always obvious from the start. So while I admit my sexual ethos may belong to a different era, I do think we should be wary of assuming that the practices of c.21st Western sexual culture are some kind of scientifically sanctioned norm.
I’ve always understood there are sound biological reasons for women to assess a man in a variety of respects before going to bed with him. That’s because , biologically, it’s the woman who gets stuck with the kid. She needs a man who is reliable, capable, will stick by her and will take care of both of them. OK it’s no longer like that in modern societies, but biological drives don’t change quickly.
Sorry for the rant but this subject has taken me by surprise.