Well, Rhea, this site is mainly about transgender people and, while it includes "crossdressers", what you're describing seems to be more related to the S & M sexual subculture, which isn't covered here much. There are plenty of forums online about, though. It would seem this is all entirely about your husband's sexual interests. In order for you two to maintain a healthy relationship for the long term, though, there needs to be as much attention you own sexual needs as to his. To me it seems a bit inconsiderate of him that he's bringing you into this without entirely understanding you own sexual needs.
Sooner or later you are going to have to realize what you want and don't want sexually for yourself. If it's compatible with your husband's emerging S & M thing, fine, otherwise, you two may have to make a big change. I can safely say that only a minority of people get into that sort of thing over the long term. A visit to a marital therapist would be pretty helpful at this point.