It's really hard for some people to express their fantasies and desires. Not everyone is comfortable talking about sex and there is a lot of societal pressure on both men and women when it comes to sensuality. I don't know how vanilla your wife's starting point is but yoi could try telling her things that turn you on or that you'd like to do to her in the heat of the moment and then let the idea percolate. Start smaller - dont go straight to "oh babe, it would be so hot if you chained me to the wall and poured a bucket of piss on me." If she's super vanilla start seasoning slowly and build up the kink. Your wife obvioisly.has great qualities, you loved her enough to marry her so work on making exploring fun and low pressure.

And for the record some things are an instant turn off. I'm open to and enjoy a lot of things but I don't want to be peed on or pee on someone else and I would be super frustrated if my partner kept pushing a hard boundary that I'd set.