It's difficult, isn't it, because to feature a homosexual character there's a sense that addressing their sexuality has to be an explicit feature. Their struggles, their identity. May people would prefer someone whose problems and storylines were not a byproduct of their sexuality, yet if these do exist, there's a sense the word 'gay' or 'lesbian' is shoehorned in - it doesn't impact anything, so does it need to be mentioned in the first place? Then you start having sexually ambiguous characters.

Quite an interesting notion.