this post was submitted on 04 Jul 2024
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This is actually a HUGE factor in human sexual selection. Other primates have visible Estrous cycles. I.e. what people commonly call going into heat.
This has a big impact on reproductive dynamics. Who mates, when they mate, etc.
Humans, for whatever reason, do not have a visible indicator of fertility, which provides females more sexual selection options. Because it's not obvious when they're in heat, they can choose who they mate with at the right time. They can also socially mate all the time, which can increase human bonding.
Not only that. Menstruation started as a way to decrease the chance of non viable pregnancies (because we are susceptible to genetic mutations which we needed to in order to adapt). Because it reduced fertility, people had to fuck more often. Not only that, men were selected on certain traits that resulted in paternal care evolving. Because well... if the mom dies, then at least the dad makes sure they both succesfully reproduced. Male chimps are more likely to eat orphans than take care of em. After all, they can always force a another one.
Menstruation became so good at reducing fertility, that we developed monogamous behaviour. Men developed the ability to bond at all. By becomming more sensitive to oxytocin despite producing less of the stuff compared to women. Men also express prolactin in the brain after their baby is born, which is hard to find in other primates. It's amazing that men don't kill infants whereas male apes and monkeys do... just to get the female in estrus faster again.
I mean just look at the other primates. The males really don't care about anything except their position, and control over females. Whereas men can love interacting with dogs. Ever seen a cat dad? That's true care and love right there. It sounds like a "duh." But there is so much more behind the behaviour.
Humans are dope.
Other primates usually only kill infants when they're not the progenitor. They don't kill them randomly
But it's often 1 male that mates. So you have a lot more males that try to kill, rather than not. And if that 1 male wasn't at the top, he'd be doing the same.