Terms/expressions for different types of gays, please!?

This is my first question, ever, on Yahoo! Answers--I've wanted to ask it since I first started coming here, but felt that I was being lazy; however, I've really had difficulty finding a nice list of gay categories (types of gays, roles, etc.). (Note: There's no sense admonishing me to consult the urban dictionary.com--after all, I'd have to know the terms, first, before I could go there and look them up, yes?, lol.) I've already learned the following (but, by all means, feel free to address these too, as you see fit--others who don't know will learn from you, and I'm sure that I will, too!)--please provide others, too!: top/bottom, verse (versatile); bear/cub; twink; daddy/son; boi... Please define these, and ADD AS MANY OTHERS AS YOU CAN!--Thanks to *all* who contribute to "The List"!!! :)