So I assume this thread isn't about very humanoid races.. Degra and Soval are not what you're looking for. Otherwise the whole thread would rapidly fill up with Ezri, Ezri, Ezri, Jadzia, Ezri.
I had a crush on Thrall for quite a while, until he went all new age. I still have fondness for him.
And of course Lady Vastra, it's safe to say that if that spin off ever happens I will be doing some serious thinking about scales.
I'll admit I think Quark can be pretty hot.
You know what REALLY grosses me out? Centaurs. Those are just repulsive.