Latin, I think you mean ethnically, a typo ? Anyway, while not an expert I would point out that even Cambodia has ethnic minorities such as the Khmer. Thais from the north are quite different than those of Issan. I ccan often tell a Chaing Mai lad - lighter and more chinese looking. Anyway, I agree that, in groups, Thai are better looking. I have a suspicion that the generality is not due to grooming ( yes, it helps ) but to a somewhat richer nation with more protein in the diet giving Thais a better structure and more stature. Again, that is a suspicion