[bloak]

I don't believe that there's a well defined thing called "physical attractiveness". It's quite possible that "looks like an entrepreneur" is part of your definition of "attractive" in this instance, in which case your observation rather boils down to "people look like what they are", which is still an interesting observation, of course, and one might want to ask how/why people look like what they are.

I think I once had to pick a medical doctor from just names and photographs. Probably my choice was different from what I'd have chosen if I'd been picking a partner in a tennis competition, though they'd be a strong positive correlation, I expect, between those two things. On the other hand, if I'd been picking a bouncer for a one-off event at a nightclub, they'd be less correlation, probably.

[atleastoptimal]

My definition of attractive generally means harmonious facial features (nothing too big or too small, positioned visibly weirdly), clear skin, symmetry, sexual dimorphism, class 1 bite with good teeth well aligned with the face and forward-grown jaw structure. Id say there is a specific "looks like an entrepreneur" element to it where these people tend to have a somewhat friendly, vaguely supercilious, clean cut, non-distinctive look. However a preponderance of the former objectively attractive features is hard to ignore compared to the people you see on the street, at Starbucks, at the Post Office, etc. I do also agree grooming and the effects of a good diet/exercise routine which correlates with the strata of educated middle upper class people who apply to YC is a factor too.