I've wondered for a long time that with facial recognition and ML, how we could better find matches for people firstly based on appearance then by other traits like personality. Could we use these personalised attractive faces and match people who have similar preferred facial features? Thus with a high level of certainty be able to predict if two people would be attracted to one another.

Or understanding if beauty really is in the eye of the beholder, or if large groups of people with similar facial features are attracted to other groups with different but similar facial features.