Well, all right. I'll tell you how I got to have an honest and open conversation about BDSM with my g/f. There is a show on HBO late night called Real Sex. My g/f and her sister saw it by accident (they have TiVo and it recorded it as a suggested pic). My g/f told me about it and I acquired the whole season. There are a lot of kinky things in this show. Anything from filming your own porn to ponyplay to underwater fetish, etc. Since my g/f saw it first she didn't mind watching the rest of the episodes with me. That planted the seed, so to say. After finishing this show we started regularly watching porn and porn like videos together. Nina Hartley's Guide to sexual submission was great. Some other things along those lines were great too. In this process I told her that I was into a lot of kinky stuff but didn't tell her exactly what. As you can imagine it scared her a bit every time, but I guess it was more her own "i'm a bad person for liking this" than what it actually was. Finally after about a year and a half of this stream of information I got her to do something that was my goal from the get go: to look up information on her own. She used wikipedia and looked up the defenition of submissive behavior and then sent me an e-mail with her interpretation of it, what she liked, what she didn't like. After that we talked a lot about what we would like to do with our interests.
In any case I think giving information about it is great. Especially as well put together as aforementioned videos and shows. Good luck to you.