Human beauty standards aren't universal. They're not even cross-cultural among humans. Even in Mega-City One, we've got the people who have the hots for uglies, fatties, and simp styles. You'd need about five hundred extra pounds to register on some people's radars or rotten teeth and scabies for others. Even among the 'normal' freak standards, you've got the retrogoth cowboy and the timeless punk look styles and standards of beauty.
If people in a single city can't decide on a universal standard of beauty, what makes you think that aliens do?
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If people in a single city can't decide on a universal standard of beauty, what makes you think that aliens do?