The challenge is homosexuals, much like heterosexuals, do not fit pre-defined molds of behavior. I have known homosexuals to be as flamboyant as can imagine and others to be very introverted where vast majority assume they are heterosexual. Games do well to show this variation in all character design so characters are not "insert identifying trait here" but a person with multiple traits. For some people a trait they have is a big part of their identity, it could be their sexual orientation, their ethnicity, their religion, their political affliation, favorite sports team, etc. For others these even out and don't have strong attatchment to any such labels.
So, my point is, rather than feeling the need to fit a quota, games should strive for variation in narrative and character to give new experiences and offer new insight.
