@FBM,
This thread is very odd to me. I didn't meet the guy I married until my early thirties and in all that time before, I was "promiscuous" for about a year and a half, long story, none of anyone's business. Even then, I was looking for someone, so I don't get the thread's seeming insistence on casual, or the more perjorative promiscuous, being without interest in more. Of course it often presents so, but sometimes someone is looking.
I did meet with a guy at an irish bar that we clicked, and went back to friends for religion reasons. He was later an attorney for me on an internecine irish matter, and my ex still consults him.
I bet a lot of women would disagree with that as a definition, that casual means not looking.
Then I did the classic get involve in your own interests thing, and met him by chance.
This thread is full of certitudes and distrusts, based on personal experience. Women looking for height or wealth.
Now we have cougars being taken as not actually looking.
Last time I saw my cardiologist, he was re-interviewing me to figure if I had some backup system of family and friends and told him about my now far away but still somewhat caring people, he got it that I married a way younger guy, by eleven years. COUGAR, he said. We both laughed and laughed (he knew the length of the marriage.) He's from India, and I was surprised he knew the word in that context.
Anyway, I think of this as the Assumptions Flying thread.