This is easily the best place I’ve ever lived for this kind of thing, but then again I haven’t looked at the sites you mentioned.
Trouble is many seem desperate to have kids, and while I love my kids, that can be quite difficult if things don’t workout. I’ll assume being from the midwest that my taste as to what makes an attractive woman is far lower than most. Or is that because I am 41?
I observed the other day at a 10 minute or so pitstop at the Chevron off La Costa/I-5 that there were at least 10 ladies that I’d lie with in the biblical sense. Some of these were too old for you/married but at least half were in the demographic you were talking. This wasn’t even going out to a pub, so I am lucky to be married in that I’d get taken to the cleaners out here. Fall sucker to the first doe-eyed beauty, and probably choose poorly.
Where I work I recall (they have since left) two of the most gorgeous software developers I’ve ever seen in IT, both about 30 right now, single, smart, fit. They seemed like amazing catches for the right guy.