Or we can all just live in monasteries and nunneries and not have to worry about women with close male friends or even men with close female friends.
Well then the birth rate goes into the toilet. And yes men are driven by our second brain around pretty women(AKA we get impulssive, impatient and start reinterpreting things that girls say).*
*My observations as a guy shown by hindsight which is always at least substantially better.