WaysideMaze said:
Jack is totally Bi. For some reason you just can't go after her as a female character.
Nor could you romance a same-gendered Tali or Garrus, despite the fact that their feelings for you were based on a wealth of feelings and history transcended SPECIES.
Garrus: "Well, I don't generally go for humans, and our body tissues are essentially poison to each other, but I respect and care for you so much that... oh, wait, you're a dude? Pfff, nevermind that shit, then!"
Tali: "I have all kinds of hero-worship issues going and I would share a gesture of trust and intimacy with you that I've never had the courage to share with anyone... but you're a girl, so... nevermind."
Shepard seems to maintain a firm policy of "no gaysies" on the Normandy, making exceptions only for Asari and non-squadmates.