I go UoN and I can confirm there’s a lot of attractive women relate to previous Unis I’ve been at or visited. Maybe there’s a Slight correlation between intelligence and perceived attractiveness.
Those who are intelligent and made it to a RG uni are probably From middle class families, who have the money to fund nice clothes, haircuts, braces etc. to make them look attractive. Also a healthier lifestyle eg less likely to be from a smoking household.
If you compare a Uni with a lot of private school kids and upper league table compared to one with more state school/deprived students at lower ranked Unis, you’ll potentially see a significant difference. Although the question is quantifying ‘attractiveness’.