Imagine any trait that increases your chance to find a mate but decreases the chance your mate survives into having another kid.

This is practically the definition of a trait that is chosen through sexual selection rather than survival of the fittest. Believe it or not, those big boobs are net negatives at helping women survive, but they sure attract a lot of male attention. The antlers on deer and moose, the tail on a peacock, these all hurt the survival chances of the creatures carrying them, but females dig them so whaddyagonnado. Riding motorcycles, driving fast sports cars, and spending all your money on diamonds and hotel suites are none to helpful at surviving, but great ways to get a certain kind of laid.

What does this have to do with great filters?