The terms gay scifi, gay science fiction, queer scifi, etc., refer to science fiction with gay themes or gay characters in major roles. Several related and more inclusive terms exist as well, bringing in other genres and other orientations—lesbian fantasy, queer horror, queer fantasy, LGBT speculative fiction, etc.
I also have a special list of my twitter followers: LGBT SciFi/Fantasy/Horror. It covers a wide variety of related topics from the perspectives of numerous fans and/or creators. Keep in mind, though, that some members there post tweets that are not safe for work (NSFW).