There is one thing that makes the alpha male sexually so attractive: power!
That power exists out of two elements: success and dominance
Alpha males are often succesful at what they do. They have a certain importance that other people crave and admire. The fact that other guys, except for admiring them, also kinda hate them, is because they are dominant. They are the strongest, the winner and the other men will always come second. These two elements are what makes the alpha male the "ideal" man, and thus, according to Darwin, the one that needs to procreate. Women will always feel sexually attracted to them because of natural instinct: they want to carry babies with those genes, that hopefully will also become alphas. Even if today we see those women not actually want to get pregnant, they still just let them fuck them, because their instinct tells them it's the right thing to do.
That is one reason why the alpha male gets to fuck girls so easily, but that would mean the girl should definitely want the alpha male to stay as the father, while we all know us girls often let the alpha male, without him having to be too nice, use our pussy for about an hour, let him cum, and let him leave, which we knew from the start he probably would. But the thing is, we just want to reward him simply for being alpha, by giving him unconditional wild sex. Because we all know that kind of casual sex is different, it's wilder, hotter, more for his pleasure. Yet the woman often enjoys this sex better as well, because they need to want to do that as well.
How about cheating? We notice that women, even the ones of which we'd never expect it or didn't expect it themselves, sometimes cheat on their own partner, which they actually love. They still just throw aside their own love for their partner, just to reward the alpha male by letting him into her pussy. This is a punishment for the beta partner, but that punishment is a reward for the alpha. His ego gets a boost because he gets to fuck another male's property, without having to work for it. Also the fact that the alpha has sex with a hot woman who does her ultimate best to please him and enjoys it a lot herself, she takes a submissive position, boosts the alpha's ego/confidence, which then again makes him more dominant and gets him more success, which leads back to, again, hot woman giving him sex, and thus the cycle continues.
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