Any biological explanation as to why lots of women prefer pretty boys

[Gr8]

It doesn't really make much sense as to why lots of women prefer skinny low dimorphism tik tokkers that would get killed instantly for 99.9% of human history it just doesn't seem like the kind of thing that nature would select for particularly since it is only very recently been that strength speed and fighting ability have ceased to matter and that is nowhere near long enough to properly effect evolutionarily what they select for.
I know that birth control messes with hormones but it still doesn't fully explain it.