You rightly point out that dating sites are dominated by males - that, in itself, is a telling datapoint!
Yes, a telling datapoint that women are less interested in casual sex than men, despite the Sexual Revolution's propaganda. It's not exactly news that casual sex is better for men than for women. Nobody with an ounce of sense looks for a life partner on a dating site.
You have statistics to back up that claim? Even if you do, I doubt that they will be more robust than the dating site stats - probably based on polling data collected on a handful of campuses, in which a measly few hundred co-eds were interviewed.
There's not much point in giving links to someone who's clearly already made up his mind, but here ya go anyway:
NIH Study on Loneliness in University Students (Sample size 538 students)
Can you cite any studies corroborating this claim?
Go onto any incel site and let me know how many are willing to settle for "Beckys" instead of "Stacys". Now I know that incels are not representative of men in general, hence my words "This is not even getting into...". But it would be equally foolish to pretend they don't exist or that male hypergamy is confined to the incel community. Men naturally want the best looking woman who will have them and there is nothing wrong with that. It only becomes a problem when the man chooses hatred and violence against women rather than to settle for a woman he can attract, even if she is below his standards.
That's not quite the definition of hypergamy, to be blunt.
Hypergamy can be expressed by the adage "women marry (and date) UP."
The corollary, is even when dating, if the man stumbles, or a much better man (who she thinks she can land) comes along, she will dump the first guy, whether forcing a fake crisis, "I have to find myself (under the other man, that is), or "this just isn't working out".
(70% of divorces are initiated by women; I have read that among college-educated women, that number goes to 90%).
While men may have a floor under which they won't date or sleep around (*), the difference is, if the man is more or less content with his woman, he is not continuously looking to trade up.
(*) slumming by top 10% men among the 6's and 7's excepted, as it is sporadic. The exception, among women, is the difference between "Mr. Right" (marriage) and "Mr. RIGHT NOW!" (hawt, worthy of a fling or one-night stand, but after the deed is done, "it doesn't count" because reasons (I was out of town / on Vacation / in Europe, it was only a BJ, he used a condom, or even the ever-popular "shut up." And yes, I have seen a video within the last 12 hours, over on patriots.win, of a woman saying it doesn't count against her N-count, if he was wearing a condom).