I know it's a hard conversation to start with a spouse you know in your heart to be vanilla.

I've done all the mock bondage, calling her naughty and threatening to turn her over my knee... even gone so far as to obtain slightly more risque lingerie.

If it works... outstanding. But you will have to decide what you'll do if you love her and she is unresponsive to your interests.

That said... not every couple need share every interest to remain together and be happy. But if you can get there with her, all the better.

Good luck.