we were not savage within our group, but we still were savage between competitive groups. as in your tribe might be egalitarian, and probably was, but other humans = threat
human fertility is HIDDEN it is not announced. what do you mean "announced?" you can kinda tell, she gets that extra glow about her, but it's not like she's bleeding everywhere when she's ready like a dog. this is because humans realized those little f**k that cry and take resources are a result of copulation. them screaming, i don't think it's to encourage others to come rape her. what the hell. it's to get the man excited