Check out Lily Cade. She is a hot butch lesbian. Real lesbian that enjoys her job.
http://www.lilycade.com/
I don't think she has a network you can affiliate with directly.
You could sign up with a vod like AEBN. And check their embed tubes and galleries in the lesbian categories. Loads of Girlfriends Films and Loves Kitty.
http://www.aebn.net/index.cfm?refid=...&salesToolId=4
I created a white label at AEBN featuring old with young. You can create one for lesbians, but not necessarily just Butch.
http://vod.teenwithmature.com/dispat...88&genreId=101