its quite possible there were never any rationalised benefits for having kids - we are motivated to have sex, and kids just happened as an outcome. Sexual revol

its quite possible there were never any rationalised benefits for having kids - we are motivated to have sex, and kids just happened as an outcome. Sexual revolution and the widespread use / availability of effective contraception is a very modern innovation in evolutionary terms - we might just be witnessing the revealed preference of humanity to have sex and not have kids