Note: This thread is in the Sex and Sexuality subforum, so
I've purposefully limited my remarks' scope to corporeal concerns.
In a world wherein exists the paradigm that "idolizes" women's physicality and that doesn't to the same degree and in the same ways do so of men, rationales such as the above are what one gets.
To wit, in a world that equally and to the same degree defined expectations and opportunities for men and women -- one in which there is, in neither theory nor practice, no material gender primacy -- practically no woman who looks Melania Trump would pair up with a dude who looks like Donald Trump. In other words, women of all ages who have "trophy wife" (given their age) looks and bodies, would, by and large, have husbands/boyfriends who have "trophy husband" looks and bodies because:
- Women wouldn't have any exogenous cause to parlay their looks to obtain lifestyle security/contentment, and neither would men.
- Women would be inspired to look good to attract and retain men, and men would do the same.
- Society would "fat shame" men every bit as much and in the same ways it does women.
- There'd be as many magazines -- general topic as well as fitness -- extolling an idealized male form as extolling an idealized female form.
Now, perhaps I'm saying that because I'm a lifelong gym rat who's only ever dated women who are equally fitness conscious.
But that isn't the world in which we live, and as a result, one encounters absurd cultural paradigmatic dichotomies such as the one the OP-er has noted. Such notions can be made sense of in the context in which they exist, but in the abstract, they, of course, make no sense.