Buffy Introduces First Gay Male Slayer. Jane Espenson explains why they added Billy to the Buffyverse:
I thought, Gee, all the work we’ve done with Buffy is about being female, and how that doesn’t mean that you are lesser. It suddenly struck me: If being feminine doesn’t mean that your’e lesser, then liking guys also doesn’t mean you’re lesser. For very good reason, we’ve focused on the female empowerment part of Buffy, but I wondered, Did we leave something out? What if someone in high school is looking up to Buffy as a role model, and we’re saying: You can’t be a Slayer.