Oh, this monster rears its head again... ok, my two cents - feel free to disagree.
Ok, for the record, I'm straight and I have no issue with homosexuality - be it in real life or in mass media entertainment. I'm all for it; I have gay and lesbian friends, it doesn't bother me, if folk want to do, I say go do.
Whatever you can do to have a good time, let's get on with it as long as it doesn't cause a murder, as Frank Zappa used to say. We're not here to argue the ethics of homosexuality out in the really real world or pump up our collective machismo - this is a gaming forum. In the game, sure, out of it, no. Not the place, even if people bring it into the room. It's like getting your sex toys out in front of your grandparents. No, just... not here.
Way back in
ME1 I wanted to make a gay space hero. Why? Because as far as I know it hadn't been done. If this adventure game had so much variation, I thought it might make a change from yet another square-jawed catnip-for-women-from-all-planets James T. My Shep would show those green space sirens a thing or two, by not really caring about them! Hahah! I'd read all the hooha about the game and it having sexual relationships in it, so I thought I'd have a crack at pushing it as far from the 'norm' as possible. Plus, since the adventure was so cinematic, I thought it would be fun to have a flamboyant, charismatic Freddie Mercury of the future kicking ass and taking names as opposed to some generic hetro-hero. I thought it would be something different, and above all, something I'd not seen before in the whole space-opera genre thing. Well, didn't get my chance, did I? I did get the mustache though.
I didn't mind; games only have so much in the way of variables they can cram in. So instead I made a female space captain who had a romance with a blue alien gal - Kirk would be so proud. Only, well, she's not
really a woman. She might look like one, but she
isn't. It's like calling a whale a fish; swims in water like a fish, totally different. The sex isn't even sex - it's a macguffin 'linking of nervous systems'. While they got naked, they didn't have to, they could have just held hands to do it. It made for more appealing cinema though; it put it in a context that didn't make the audience go "wtf?"
Literally speaking, in my book there is no non-hetro relationship in
ME1. If people choose to interpret it that way, fine - nothing wrong with that at all. So
ME2 rolls around, and we get Kelly, who is to me at least a mite too, well,
overt in her interest in Shepard. I was convinced she was a mole put there by TIM (much like I thought Conrad Verner was going to use that picture and my signature in
ME1 to make some kind of 'Shep hates aliens' propaganda to get me air-quoted at again) , but instead she just wanted to get in
any Shep's jumpsuit. Kelly I can happily accept as bisexual, being human and all, and not once have I romanced her. I can't even get her to feed my damn fish, never mind this lapdancing lark! I obviously fail at being Shep regardless of how much ass I kick...
Insofar as the actual love interests in the second game go, none of them step away from the hetro-allignment (save Morinth/Samara, if you choose to read Asari that way). I was afraid Jack would be yet another bisexual-bad-grrrl, but she wasn't (with a Femme-Shep at least). Good job, Bioware (though not so good at allowing female Shepards to talk to her, but that's another forum thread). That would have been a stereotype too far for me. As far as the other romances are concerned, I've played through them all with the exception of Miranda (who I'll get to once I'm done with my current playthrough - I'm chasing the
prize 
) Morinth and Thane. The romances are to many fans an extremely integral part of the ongoing Shepard storyline, and as with the Asari thing, it's only natural for people to want things a particular way to suit their own preferences. The thing is, as much as we feel like it's our story to play out,
it isn't. It's the guys at Bioware's.
We're just along for the ride. Face it. We might get to make crucial choices along the way, disregard one love interest over another, talk tough when we want to, be merciful where we feel the need, but the story still has one way to go - to
Mass Effect 3. If they want to allow us to make Shep bi/gay/lesbian/I break for Rachni, they will do. I can see why some people would want to play a particular sexuality for a character in a game where intimate relationships play such a large role, and if that spins off into fanfic, art, mods, whatever,
it's still not causing a murder. The internet is big enough to let everyone play, voice their opinions, etc. in a way that suits the enviroment. In the end though, it's not our call. We can ask for it if we want it, and if we do and get it, groovy. If Shepard can have a gay/lesbian romance, cool, it won't stop me enjoying the game or make me enjoy it more. But the story for now has lined the existant characters out sexually - not much that can be done, and setting one another on fire isn't going to make it all better for either side of the argument. Whatever we want Shep to be, and all the other characters that are along for the ride with him, it's out of our hands; no more than we can change characters in a movie. Shepard will never though be an extension of ourselves in the end, because we're not in control of the typewriter.
Sorry for going on... my posts are turning into digital diazepam