As a female who plays female toons, I have yet to find a male companion that would be suitable for marriage.
Seriously look at the guys in came, talos, andronikos, vector, doctor loken and gault? Really? I'd rather marry Khem.
Also I love the sexy slave outfit, how about a sexy male companion with a sexy g-string to flaunt around the fleet?
If not I guess i'll just have to go gay when you let me...
Makes me think all the bioware developers are men and the girl/girl thing was the plan all along....