My husband is like Christian Grey in Fifty Shades of Grey! I'm not into the dominatrix submissive thing at all. What should I do? Is that grounds for divorce?

While I feel that a little bit of experimentation works well for anybody's sex life, it has to be voluntary and not forced. You can reason with him saying you are not interested in any kind of BDSM activity. If he still does not relent and compels you to participate in such activities, then I'm afraid things need to be escalated. You both can approach a marriage counsellor or a sex expert to see how best you can pleasure each other in a mutually satisfying way. In worst cases, yes, this could be grounds for divorce too.