Strange Horizons has opened submissions for a special issue titled "Queer Planet". And yes, they give a complete guide of exactly the types of stories they're looking for. Story length is up to 10,000 words. The deadline is April 10 and payment is 8cents a word. They have an on site submission system that shuts down when they reach their daily maximum number of stories so be patient and get your story in early in the day :).
UPDATE: And that was planet not plant - I think my brain nodded off while I was typing.