The natural state of men
At his core, every man is a worthless nothing, an undeserving nobody, a fraud and impostor. This isn't objectively true, but it is the way men view themselves and the way that women view men. Men must accomplish and achieve to become a something. Hence why men are human doings.
In other words - men operate from an emotional deficit, from minus zero.
The male world is also a strict meritocracy. Fake achievement means nothing and your feelings be damned. Higher achievement is more valued than lower achievement. So when a man tries to become a someone, his budding ego will constantly be knocked down by men and women alike.
Male sexual desire
If not for the extremely powerful male sexual desire, men would never interact with women, ever! Men and women are so different and hardly relate to one another. We're like foreign creatures who are annoying and who we can hardly relate to. So why bother with them at all? Add to that the male propensity to be alone and the question intensifies, why would a man ever interact with a woman?
Because sexual desire. That's why. Sexual desire in men is so strong that it'll override all logic and reason and draw a man towards a sexually appealing woman.
This desire tugs at men constantly. When he encounters an eligible woman, his eyes will take in her boobs/butt/figure and all kinds of things start firing in his head within a split second, before he's even conscious of having seen her. Only then can he avert his eyes/mind/attention elsewhere. Most men have good reason to avert their attention most of the time. Most men do this most of the time. It can be a battlefield in the male mind just walking down the street. Especially for young men. This may sound crazy to women, but it's true nonetheless.
Add this intense sexual desire to the feeling of being worthless described above and the man who dares to approach a woman is operating from an exponential emotional deficit!
Gatekeepers of sex
It's therefore no wonder why women hold all the sexual cards. The male desire for sex is that much more powerful + the male sense of worthlessness is ever present = a desperate need for female sexual desire and general approval of character.
When a man approaches you, every rational fiber of his being is telling him not to take the risk. His little head is what's driving him to you. This is as true for couples who are married for decades as it is for singles looking for a mate.
When a woman is not interested she thinks, no big deal, I'm just not interested. But to the man who approached her, he just put his whole being on the line and was tossed away. This is an unavoidable part of life that every man will experience many times. It's important for women to understand the power that they hold so they can use it constructively. Application of this idea will be a topic of a different post.
Men operate from a double deficit 1. An overwhelming sexual desire 2. The sense of worthlessness being the default. Therefore, women are the gatekeepers of sex.
Edit - back to the basics - men are the gatekeepers of commitment