At least here in the United States, we have a fairly long history of relegating stories about gay people into the adult category. Years ago, I remember Roger Ebert complaining about a movie he reviewed being rated R. He noted the lack of foul language, nudity, violence, and explicit sex scenes, the hallmarks of an R rated movie, and concluded it received the rating because the story centered around two gay boys. And of course in our current cultural climate we have a lot of people trying to excise books with gay characters from our public and school libraries. It really isn't about sexual content, as even stories with gay characters are challenged.