Lets keep it simple, and think biologically on the evolution of human sexual selection.

Men evolved to have high sexual drive towards a lot of women, and some could easily be thinking about fucking different girls all day long if they're particularly brute (this what a fuckboy is, btw). These are men who value their own animal instincts over reason, logic and personal development. Women evolved to be picky, and some could easily pick men based on their position in the scale of how much of her selfish interests he can satisfy if they're specially stupid. These are women that value exclusive benefits for them over love, companionship, and compatibility.

Men that fit the description are said to be only guided by their animal instincts (and hence, they're called "brutes", or any other derogatory adjective). Women that fit this description are, at best, calles "hypergamous". At worse, they're called "women with high standards" (no derogation, whatsoever).

Why the double standards? Why the hypocrisy? Why do we demonize sexually-driven men, while we equate hypergamy with the sacred, unquestionable concept of having "high standards"? That is madness, and needs to stop. We must understand that having high standards is a relative concept, so it isn't a good thing for most girls: with the exception, perhaps, of the highly intelligent ones.