So far Garrus is my main squeeze, he's just so cool and adorable. I killed off Kaidan with my main femShep, but I went back to see what happens when you save him. 2 things turned me off:
1. FemShep throwing Kaidan over her shoulder when rescuing him from the bomb; dude, I know you're hurtin', but at least pretend to man up before I gotta haul your ass out of there.
2. During the bedroom scene, Kaidan starts talking about wanting to protect femShep or not let anything happen to her (I forget the exact wording). Dude, I just threw you over my shoulder to save your ass and you want to protect me? (The sex was hot, though... too bad.)
I do want to try all the romances, though. Also I hadn't considered doing too many playthroughs with manShep, but then I saw this
youTube tribute to the Tali romance, so now I'm curious.