My wife knows somewhat .. probably mostly from the occasional, careless "left a browser page open" ... woops!! Couple of years ago, I had purchased/downloaded a couple of movies from Kink's "Sex and Submission" area that she stumbled upon. Yea, that didn't go over real well ....
As a couple, we used to be pretty adventurous (which will be reflected in some stories I intend to post - tho I'm wayyy behind on getting my first posted up), but over the last several years, she's lost interest in most of our adventurous past and fantasy-laced activities.
She's unaware of the delights of Kristen's community ... at least, as far as I know haha.