The vast majority of people (men and women) screw around when they're younger, then settle down when they want to raise a family or meet someone they can stand for longer than a few weeks. Some people settle down earlier with the first partner they meet and only ever sleep with one person, for others it takes longer. Everyone is different. RP/PUA is pseudoscience at its worst. It takes a few tenuous studies, things which sound like they should make sense (this sort of thing is strong in broscience too, like the "stoke the metablolic fire by eating six times a day horseshit"), draws a lot of conclusions and presents the results to desperate guys who just lap it up and recite the same old bullshit over and over again. It's becoming cult like.
Some of the concepts have vague roots in reality, but wouldn't most people realise that confidence/standing out a bit/actually making moves and playing the numbers game is going to net results? That wall of text you posted is fucking terrible Dumar. It could be written quite easily to cast men in just as awful a light. What is carnally attractive to an 18-22 year old man? Well basically anything he can insert his dick into if you're dealing in stereotypes which your article does. At younger ages most (and again its not all) men and women are both just banging whatever they find attractive happy to be even having sex, and shock/horror this actually differs from woman to woman! Can you believe it? I got many BJs at age 22 outside/in a bathroom/etc, and I was most definitely not an "alpha bro".... young people have sex and doing so doesn't make anyone washed up when they're older. As for the whole "best sex" thing, again that article is just playing into people's fears and insecurities. There are a lot of variables that make sex great, and I'd gladly argue that being with someone over time, learning their fantasies and being completely relaxed in their company make for a far more fulfulling sex life than just banging some chick after a house party at college.