Who am I to judge? I thought the female Xyrillian who impregnated Trip in one of the earliest episodes of Enterprise was really, really cute. Twi'leks, huh? I like your style, Clegg.
If by that you mean get head. And tail. Yes. Seriously, though, Twi'lek girls can be pretty attractive and seductive looking. Oola the ill-fated dancing girl from Jabba's Palace...Sebulba's twin slave girls from the Boonta Eve Podrace hangar...Shakka, the red Twi'lek who hung out in the podrace box seats with Watto. And let's never forget the one and only Aayla Secura. Yum.
There's also the Tonnika Sisters from the Mos Eisley Cantina in ANH. They look sort of like simple humans with elaborate hairstyles and not very extraterrestrial at all, but from what little I've been able to read about the characters the original intent was for them to be alien humanoids of some other species. No matter what the hell they're supposed to be or what planet they hail from, they're a cult duo in the SW fan community and there've been efforts to try to get action figures made of them...but for some murky and legally complicated reasons the original actresses won't allow their likenesses to be used for toys and collectibles.
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.
Lady Grilka (Mary Kay Adams) from two episodes of DS9 was attractive and physically appealing...for a Klingon female of that era of makeup and costumes. Quark could have done far worse than end up married to and living with her.
Great, another generic green-skinned scaly monstrosity. She may have had a rockin' body millions of years ago, but now she's just a cold-blooded venomous skank with a loose dewlap. My hemipenis remains internal. I wouldn't even let her in my terrarium. Thumbs way down.
Okay, just a couple of images that I find sexy and/or physically attractive. Now, just go ahead and assume all or most of the humanoid species in Star Trek. They're just humans with some blobs of makeup. Let's make this a little more interesting (as teacake has done). M'Ress (And a shitload of other Caitians - Star Trek) Florence Ambrose (Freefall) Neytiri (along with a shitload of other Na'vi - Avatar) Luna (MLP:FiM) I could go on for a while, but this should be sufficient for now. Also, these are just the ladies.
You know what non-humanoid is REALLY hot? The Horta. Okay, to be serious, confession time. The first time I ever found myself thinking a non-human was actually very attractive was when I was a kid and watching the original 1933 King Kong which I have seen at least 20 times. I thought King Kong was much more attractive than Fay Wray and you know if it was ME in the palm of his hand I wouldn't be doing all that screaming and throwing my arms around. Didn't she realize she was just scaring him? Anyway I thought he was very uhh.. manly. And a sympathetic character. I would understand him.
There was also the Aslan infatuation. But I soon realized that Aslan was supposed to be Jesus and we are NOT supposed to find Jesus hot so I got rid of that little fling in a hurry.