If you manage to talk to him and put it down then as long as he is slightly Dom he will most likely be willing to go further. In all honesty I rejected what I liked, bdsm, at first but then once I found the most amazing girl who helped me "admit" it per se I started getting drawn farther and farther into it. I dont know how I could survive vanilla anymore *laugh* but if you manage to show him and lead him to something he likes doing on a bdsm site, any site, and then slowly show him and expose him to more and more things branching off it would probably help him accept it, or even if he isnt "naturaly" Dom, then you might even get him to want to try it and have him like it.

My first thoughts when I saw bdsm were "thats sick" but I couldnt look away and I loved it and got over the social stigma of bdsm.