>>136670>didn't survive nearly as long as we do today.I suppose it depends how far back you want to go. Modern anatomical humans have been around for at least 100,000 years, with some archaeological findings suggesting it may be closer 300,000 years. When I hear "humans didn't live as long in the past" my mind immediately goes to the misunderstanding of
average human lifespan. There would have been untold amounts of infant and child mortalities, which brings down the average of how long it seems a person might live to be. From archaeological remains, however, we know that people people regularly lived to 50-60 years old when supported by others.
Unless by "early hominids" you're referring to distinctly far older pre-modern anatomical humans, like Australopithecus, who lived 2 to 4 million years ago, I don't not believe what you're saying is correct. Otherwise, my mistake.
>you'd need to explain how the quick ejaculating behavior of other species was selected against enough to become a minority trait.That's not inherently how evolution works. If there are multiple traits that are non-dominant, and they do not obviously contribute to fitness or improved conception, then there is going to be little if any selection pressure for either trait to become dominant besides geographic distribution and population bottlenecks.
>since early humans lived in tribes instead of nuclear families, the burden of child rearing would have been spread out instead of relying on the father primarily.Right, but in such an environment you cannot simply leave altogether. Rape is a near universal reviled crime across human cultures. If we imagine a tribe (200-500 people), or a band (20-50 people), there would likely be severe social consequences for the offender. This being the case, there is no benefit to premature ejaculation. In most ancient histories and stories we have, a common punishment for severe crimes is exile, and in pre-agrarian times that would have likely meant almost certain death.