SNIP
And "Deal with it" is overused, irritating and cuts both ways; you guys have to deal with the fact that he has a valid and non-trolling request. And no, we are not all homophobes asking for homosexuals to be persecuted. You simply can't FORCE tolerance. An option at the character setting stage is a good and fair suggestion for future games.
Since I was one who said "deal with it," I'll address this.
I didn't think the OP was trolling. I still think the request is silly, for the reason I outlined; aside from people who are married or engaged, nobody in reality wears a giant sign declaring their sexual orientation or preferences to every stranger. I mean, I would love it if, at the start of my life, everyone I'd ever meet would know that I want to only be approached by females I find attractive, but that doesn't happen. When gay men or unattractive women are attracted to me in reality I have to eventually face the awkwardness of the situation and resolve it somehow. I'm not "forced" into tolerance, except by the legal system and whatever religious or ethical codes I follow. I mean, unless you consider the absense of a renegade interrupt to shoot Cortez in the face "forcing you into tolerance." I don't think you or the OP meant that, but, what in-game action would you rather take then the ones offered?
Further, the other character creation options are mostly about reputation which shapes what other characters in the universe think about Shepard. Shepard is famous for killing lots of Batarians (either heroicly on Elysium or ruthlessly on Torfan) or surving the thresher maw on Akuze. Shepard's place of birth is in his file, which is why Udina, Hackett, and Anderson talk about it right at the beginning on ME1. I'm pretty sure that regardless of whatever Shepard's sexual history is (and he's 29 in ME1, so he probably has a sexual history) it wouldn't be widely known. The other love interests only know about what you did in ME1 and 2 because they've either been with you for the past six months or they're reading some kind of intelligence reports on your activities.
I don't mean to be insulting, I'm actually really trying hard not to be insulting to anyone. But it's silly that you're willing to take on saving the entire galaxy, a burden that nobody can really bear, but can't deal with unwanted sexual interest, which happens to everyone all the time.