system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we men seem to be driven away from the thought of monogamy, and marriage in general, but agree to it anyway? Is agreeing to it based on cultural standards? (I do not speak for all men. Only ones that feel the same way, openly or secretly)
gpt
Biologically, a human male's ejaculation contains on average 150,000 sperm cells. Only one sperm cell is needed to fertilize an egg. Meanwhile, human females release an egg every month and, if fertilized, require 9 months of pregnancy.

From this purely biological standpoint, males only lose out in terms of spreading their genes if they stick to one female. Females benefit if their male partner is monogamous since his attention is not divided on other females.

However, culturally and economically, it's preferable to practice monogamy. Most places nowadays have a 1:1 male to female ratio (in the distant past, men were more likely to die due to fighting which skewed the ratio towards women) so equal pairings would prevent an excess of single men. Excess single men can lead to problems in terms of unrest. Plus, two parents providing for the children has more benefits than a single parent in terms of earnings and childcare.