I've told three people.
First one was years back to a girl I was in an online relationship with, and was actually well received.
The second was my second wife after she kept asking me about any kinky thoughts I had. It came about after/during a romp in bed while the dog was in the room, and decided that he was going to try and join in. At that point in time, I had never been with a dog, but had thought about it here and there, but dismissed the idea because I didn't think a male dog would even be interested. (Boy, was I wrong!)
But that experience led to a deep philosophical train of thought.
Things like "If they want what they want and it's clearly evident, and I want what I want, and it happens to be the same thing that they want, and nothing harmful or negative comes out of it for either one of us, then what business is it of anybody else's? And how is it "wrong" in the grand scheme of the universe?
Anyway, that event and train of thought led to discussion with my wife, who at the time led me to believe that further/deeper discussions were welcomed. Later on, she held it against me, however in her defense, we later found out that she was going through medical problems that caused hormonal problems, that caused mental issues. So at this point, it's difficult to nail down her exact position on it, although I think the relationship is now broken beyond repair because of broken trust on that (because she ran and told anyone that would listen about that and other intimate matters in an effort to shame me into doing what she demanded.) and other matters.
I'm starting to think that for one, I do not want to live the rest of my life with someone that would judge me if they knew, or that I would have to hide it from.
So for me, I'm either going to be single where humans are concerned, or if I do get into a relationship with a woman, it will have to start in a place like this or something and be with someone that at least accepts me, preferably is also into it themselves.