I'm open with certain people, essentially close friends who aren't the prying kind. I used to be more open, but certain friends of mine were indiscreet and didn't see why it was not a good idea to talk about my kinks, conquests, and the like to people I didn't really know, which rightfully so, PISSED ME OFF.
I just don't tell most of my friends my personal business anymore. I like the privacy. My business, unless I choose to share it with other people, is my own fucking business.