Is it a problem that heterosexuals wants same-sex romances too? And how do you know it's mostly guys who wants to fantasize about lesbian sex? (There's a hidden lesbian sex-scene that will be added that I haven't heard of? Is it unlocked by turning up your PC's brightness during the black-out or something?)
As Punkre said in an earlier post, people play games for different reasons. In SWTOR I play through the stories of fictional character I created, and sometimes those characters are hetero-, bi- or homosexual, maybe a-sexual. I don't do it because I want to fantasize about lesbian/gay action but because I made that particular character like that.
I'm glad we get same-sex options added later on and if it also gives bi- and homosexuals the option to play a romance they can/better identify with then it's a win-win situation IMO.