This is true in most mammals and birds where the males have the brighter colors, the manes, bigger horns and overall specifically aesthetically created evolutionary parts.

I think it may be true of humans. I mean men don't groom as much as women, don't use make up as much and still are up to par (better looking in my opinion but a lot of bi people say men and women generally look similar or they something like (yeaj I find X generlaly prettier but when a super hot Y comes up its.mindblowing and I dont see that from X)

I think it is a viable theory to be had.