Having sexual intercourse with someone of the same gender is usually a choice (Assuming there is no gun to your head). It is at least as much a choice as being overweight, underweight, or continuing an addiction. As a matter of fact, in some cases stopping an addiction can be deadly, but refraining from homosexual relationships is not.
Perhaps not directly. But depression can kill you (i.e. suicide) - and depression and/or suicide could be the end result of a misguided attempt to fight one's own natural tendencies.
We have already tacitly decided as a culture that we have no problem telling people to fight their natural tendencies; that ship sailed a long time ago.
We tell the fatasses to lose weight, and bombard them (and allow corporate d-bags to bombard them) with propaganda to get them to hate their bodies (so we can sell them diet and exercise products that won't work and we know won't work). How many fat people suffer from depression? How many of these people commit suicide annually?
We tell the ugly (and less than “knockout-level” attractive) people (especially girls) to do everything in their power, including surgery, to transform themselves into something that should be allowed to appear in public. How many teenage girls commit suicide annually because of the unrealistic body-images we show all day long on TV?
And you know what? We get the hell over it, because that's how the economy works and it's how we pay for all of our entertainment: if it weren't for the ads that make us hate something about ourselves, our bodies, our finances, our self-esteem (hah!), our allergies, our car, our house, our ISP, ad infinitum...there'd be no money to pay for the TV, radio, magazines, newspapers, Web sites, etc. we use every day...and there'd be no reason to buy much of anything, and there'd be no paychecks for the auto workers, drug makers, home builders, and sweatshop kids making all that crap we buy but don't need.
Sometimes it makes us feel bad, but we have a cure for that too.