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I think if Aria was romancable... daym I would've picked her too! Probably would've been my second fav romance XD or or Javik.. I always wanted to romance Javik.. would've been so epic romance XD
I'm not into lesbian romances either for the same reasons as yours. xD Buuut I'll be honest, if Samara was romanceable, I'd romance her in a heartbeat. (What is it with me and being attracted to older, thousand year old beings?)
Aaand, while I love the Kaidan romance, I was hungry for some James Vega loving... If he was an actual romance, I might have left Kaidan for him. Don't ask. Don't judge. 
I still love you Kaidan...
I have a hard time playng ME and not romancing Garrus. I've tried a Thane romance, and I really liked it. But I never have found the strenght to play that Shep in ME3. (I don't even finish anymore ME3. I just get Anderson speech, than turn off the PS3. I can't digest any of the endings. They are all equally horrible and make me feel sick
)
Liara I know I'm in the minority, but I really don't like her. I find her quite bland, never really resonate with me. With Miranda I've learned to respect the character, I liked her protective nature towards her sister. With Liara... nothing. I just felt like the game trowed her in my face screaming "here! she is blue! she can reproduce with everything who breath, LOVE HER!!!!" at every corner in ME3.
I have in mind to try romancing Tali one day, but for maleshep my preferred romance was Jack. A pity her very small presence in ME3, where she became really interesting.
I felt the same way about Liara. She's sweet, but I felt like Bioware has been pushing her on my face when I'm really not interested in romancing her. 
As for Tali, I'd love to try romancing her with a male Shep one day. (My male Shep romanced Jack.)