People have had this idea before. It's called "eugenics".
Not quite: eugenics is a set of techniques that isn't certainly limited to sexual selection. Plus only humans could practice eugenics. Instead, anything with a brain and sex can practice sexual selection.
BTW, ferns have feromons, they might be able to choose their partners. At least, we don't know yet if they do. Would you call it sexual selection, if it leads to preferential inbreeding/outbreeding/between-species breeding?
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