Culture determines the ways in which people are expected to perform gender roles. In some cultures, the dominant mores emphasize female subordination and distinct social and economic roles depending on gender. For example, in the hunter-gatherer cultures of the Kalahari, men hunt and women gather plants.
In cultures that value patriarchal systems of inheritance, adultery is severely punished because it carries with it the possibility of a man supporting and investing in a child he did not father. The cultural value of legitimizing authority based on blood relationships (aristocracy, monarchy) results in systems of behaviour in which (pre-DNA testing) fatherhood can be determines by married females engaging in sexual congress only with their husbands.
"social clock" is a good way to explain social roles that culture determines for people.
people feel late if they could not catch their scial clock.
For example, being 35 and having no kids may upset a woman even if in the past she did not think about having one