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Survival is the #1 indicator of passing down genes, sexual selection in most species is merely a slight limiting factor.
A greater percentage of the sea turtle population is lost via death than pool sexual selection. Same for birds that mate for life.
To analogize nature to our current circumstances you would need to look at selection models based on sexual selection only, which is why I brought up the guppy study, as it strengthens the fischerian runaway hypothesis and weakens/disproves the "good genes" hypothesis. To prove your point you'd need to show that sexual selection universally increases survivability, which I don't think is possible, ergo I disagree with your prognosis that our current fischerian runaway in humans is positive or good.
You also don't account for birth control in any of your arguments, which is an atrocious blind spot, as sex access =/= childbirth.