system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are faces the biggest factor in attractiveness? Is this consistent through cultures? through time?

faces are the most important part of initial attraction, at least in the developed world. What does the face convey that drives sexual selection to favor facial features even more than muscle mass or height? Is this consistent through cultures and time? What about other primates? do they also value facial features more than the other typical selection markers?
gpt
A lot of genetic abnormalities express partially as craniofacial abnormalities, and these same abnormalities can indicate abnormalities with brain development or systemic abnormalities that reduce survival and general fitness.