Science fiction and fantasy like to explore aliens, goblins, and everything in between. In recent years authors have gotten more comfortable writing outside of heterosexual binary terms, but there is so much more than making a character gay or straight. This panel will cover, in both simple and scientific language, what the social and biological definitions are to gender, sex, sexuality, and expression. Ample time will be given for audience questions, and a discussion will be had about how these four elements must blend together to make believable characters.