* '''Arranged marriages vs free mate choice''': Historically, arranged marriages were often the norm, so today's dating world mismatches the mating expectations that we may evolved to have for our parents to be involved in partner choices. In a large sample of hunter-gatherer societies, 70% primarily practiced arrange marriage,<ref>https://journals.sagepub.com/doi/full/10.1177/1474704919887706</ref> and also in medieval Europe arranged marriages were the norm.<ref>http://www.dfwx.com/medieval_cult.html</ref>
* '''Affirmative action for women''': Women have never occupied higher status than men,<ref>https://incels.wiki/w/Scientific_Blackpill_(Supplemental)#Women_were_historically_predominantly_involved_in_cooking_and_they_never_dominated_men</ref> so
women [[mog]] ging men left and right may be a source of great confusion and [[shy]]ness. In women, combined with their [[hypergamy]] it also causes a mismatch as they naturally expect to find men more dominant than themselves, and rather [[femcel|staying singles]] when failing to find a partner who matches their expectations.
* '''Atheism''': Most human societies have also been highly religious, whereas modern civilizations are highly atheistic. Atheism tends to imply lower birth rates.<ref>https://link.springer.com/article/10.1007/s10680-015-9371-z</ref> This may be highly related to the aspect of arranged marriage, i.e. perhaps atheists practicing arranged marriage may be able to attain the same birth rates as religious groups.
* '''Behavioral sink''': Other mismatches may be overpopulation, an aging population or even the rise of [[mutation]]s (see [[behavioral sink]]).