That "40% of men ever reproduced" figure is due to bottlenecks created by conquest by technologically superior cultures - whole male populations were exterminated and female ones enslaved during the Indo-European expansion.
Unless bandits are riding up, murdering, and raping everyone, then that figure doesn't apply to ordinary circumstances. It's a function of intrasexual, rather than intersexual, competition
That "40% of men ever reproduced" figure is due to bottlenecks created by conquest by technologically superior cultures - whole male populations were exterminated and female ones enslaved during the Indo-European expansion.
Unless bandits are riding up, murdering, and raping everyone, then that figure doesn't apply to ordinary circumstances. It's a function of intrasexual, rather than intersexual, competition