Which of the non-human races in Star Trek universe do you find overall the sexiest (physically attractive, interesting, etc.)? Not counting those who look 100% like humans (most TOS "aliens", for instance).
For me, it's Vulcans followed by Cardassians.
Bajorans aren't bad either (the nose is cute and I like the earring :-)).
Of course, TOS Romulans who looked just like Vulcans would be on the list, but definitely not the uglified TNG and post-TNG Romulans. Not just that the makeup is ugly, it also doesn't look natural at all, it just screams "this is makeup!"