"""But seriously, surely looks are a very subjective thing?"""

Subjective as in: "the beauty (or lack thereof) of a person X is not a law of nature, different people can have different opinions on the matter", yes.

But subjective as in: "statistically people don't tend to agree to what's beautiful/ugly", then no.

I could be finding person X beautiful, and you could find it ugly. But showing him to, say, 100,000 people, the opinions won't be 50-50 or close (=totally subjective). People tend to agree. Only if the person is rather bland looking the statistical results will be totally random and not skewed towards ugly/beautiful.

Consider an experiment of showing a picture Anjelica Jolie to 100,000 males to mark as ugly/beautiful. I bet I can predict the results.