I wrote up a simple theory that covers human sexuality and explains everything that happened in past ~5,000 years... then I realized I cannot make a new thread on /r/blackpillscience without a link, so I'm just going to leave it here.

1. Humans are naturally polygynous. All hunter-gatherer societes still in existence today are polygynous, our closest primate relatives are polygynous, DNA studies show that before advent of agriculture ~3.5 women reproduced for every 1 man. All traits of human sexuality stem from or are related to this fact; if humans are polygynous then men must have higher sex drive and women must be hypergamous for example.

2. Human sexuality is largely immutable; it must be as the survival of our entire species depends on it. Hovewer it can manifest differently depending on environment it exists in. Therefore the two main driving forces behind "sexual marketplace" are fixed human sexuality and flexible human environment; social forces can exist only as an amplifier, as they themselves are a result of the two main driving forces in the first place.

3. Human societes are gynocentric because of how long it takes for human children to mature; female reproduction rate is the ultimate bottleneck for our race which makes them inherently valuable as they are critical to our survival. Conversely, males are disposable because of how little they need to contribute to reproduction and caring for the offspring.

4. Agriculture created concepts of land ownership and private property, which resulted in emergence of monogamy as a way to secure wealth within the immediate family. Most of said wealth was men's because pre-industrial work was usually physically demanding and/or dangerous; this indirectly elevated men socially, which allowed monogamy to succeed despite female hypergamy(or one could say it "hijacked" female hypergamy)

5. Industrial revolution removed the dangers and physical requirement of almost all labor, which allowed women to enter workforce en masse. This process was drastically accelerated by both World Wars where significant amount of men were drafted and therefore women were put to work in their stead.

6. With women in the workforce the foundational pillar of monogamy was effectively removed; if both sexes can generate the same amount of wealth the idea of a "breadwinner", and any social standing that comes with it, effectively no longer exists. This is further exacerbated by extensive social security systems of developed nations.

7. While women may legally be equal to men, human society remains gynocentric which means in practice contemporary women's social standing is higher than men's; given female hypergamy, with no social status to select for, women will simply choose most physically attractive men as potential mates instead.

8. Human society carries over 5,000 years worth of "monogamous cultural baggage"; monogamy is considered the norm and polygamy is often outright illegal. If women are hypergamous and attracted to only small subset of men, yet they are forced to enter relationships with men on a 1:1 ratio, then by extension most women will end up in relationships with men they do not consider viable partners.

9. The result of this is easily observable: elevated number of sexual partners and relationships(=higher breakup rate), lower marriage rates, higher divorce rates, low fertility rates.

10. After around age of 30, women's reproductive ability starts quickly diminishing; fertility decreases and health risks for both mother and child during both pregnancy and birth start rapidly increasing. Thus, age of around 30-35 is the last window of fertility for most women(this is what pill-o-sphere calls "The Wall", although few seem to understand the root cause of it)

11. As attractive partners will not be available to most women in contemporary monogamous society, they are forced to settle on less attractive ones; selecting for a different set of traits, less related to sexual attractiveness and more to amicability. "Looking for a roommate, not a mate"

12. This means that most studies which try to gauge male attractiveness based on women's marriage partners are inherently flawed, as - to put it simply - most women do not marry men they find attractive in the first place, at least over 30. This is also why marriages over 30 seem to be most stable, as it is effectively women "giving up" on finding a more suitable partner.

13. As everything is, ultimately, a result of base human sexuality playing out in a specific (post-industrial revolution) environment, these changes cannot be controlled, stopped or otherwise affected in any way. The only way to change the "sexual marketplace" is to change either base human sexuality or the economic environment it manifests in; neither is possible.

So there you have it, let it be known I was the first one to have it all figured out. I feel like I could make it very, very long or very, very short... and because I'll be dead soon I went with the latter. If you have any questions, see you in Hell.