The obvious rule is that you have to enjoy homoerotic content on Buffy The Vampire Slayer and Angel.
What defines homoerotic content is up to you. But, generally, yes, it involves two characters of the same sex involved in something that could be construed as sexual in nature.
Also, it helps to have a website. We know that you can love homoeroticism and not have a website, but we want this clique to be known, and being on websites is the best way. If you don't have a website, it's okay, but generally, websites are better. And only one website, please. Because it just looks wrong otherwise.
That's about it. We'd also say play fair and don't be mean to anyone, but y'all know that already, right?