* '''Behavioral sink''': Other mismatches may include overpopulation, an aging population or even the rise of [[mutation]]s and disruption of social epistasis (see [[behavioral sink]]).
* '''No responsibility''': Historically, marriage directly concerned important questions about inheritance of land and wealth. Today, there is a growing disenfranchised population that has virtually nothing, is in debt and merely rents properties from landlords. This is exaggerated by economic stagnation. Millennials have only a fraction of the worth babyboomers had at the same age.<ref>https://archive.fo/wip/z8CaW</ref> As a result, traditions and adaptations concerning heritage and responsibility lose their meanings.
* '''Milder ecology''': Historically, males needed to fight and compete for survival. Today, resources are directly provided to
womenm if necessary. Male competition is prohibited and men are shamed to be nice and agreeable, which also reduces ecological harshness (see [[antifragility]]).
* '''Environmentalism & pessimism''': Historically, it was rarely ever a question to not have children. Usually, children were needed to maintain land, power and wealth of the family. Associating something bad with reproduction is highly evolutionary novel.
* '''Late marriage and no enforced monogamy''': The age of marriage is very late in many Western countries because of [[feminism]] and economic stagnation. This means nobody enforces monogamy until the late 20s or early 30s, and the result is a more feral dating landscape that [[life history|r-strategists]] heavily exploit and which does not cater to people who are rather interested in long-term [[relationship]]s ([[life history|k-strategists]]).