I've only told people online under anonymity. Never told anyone irl, ever. Far too great a risk. I'll only ever tell someone if they tell me about themselves first, which hasn't happened, and I don't expect to happen, because when the subject comes up, I act like a total normie about it, and so I wouldn't come across as someone you could tell.
I would like to be able to tell those closest to me, just so I could keep it a little less secret, but the risk is too great. I feel I owe it to my boyfriend to either tell him or dump him, as I'm mainly sexually attracted to animals and it would be wrong of me to rope him into my charade of a normal gay life. So that's a decision that'll have to be made at some point.
Edit: I made the decision a week and a half ago. Single now, hoping to find a fellow zoo to build a zooey private life with.