>>715273650
>muh commies
What the fuck are you talking about? Still, in the same way you have countless of human cultures and societies where intrafamiliar sexual encounters during childrearing are common and even encouraged, so you can't consider situational cases as an objective truth, specially because there's literally not a single piece of our biology, neurology, evolutionaty history or genetics that's found to have this function, it is literally an isolated cultural phenomenon
>kin recognition
Not a thing, every single male animal in nature will unequivocally mate with his female offsprings if she has her oestrus around him