sometimes, there is no right answer, only the best wrong answer
as for me, i'd just tell them, if they are going to think less of me just because of one my more or less accepted fetishes or interest, then maybe i shouldnt be going out with them in the first place eh?
Depends on the person, but ultimately, I agree with that.
As for your answer Tw1sted, while it's acceptable to think that, you may need to consider her feelings in that scenario. Simply put, if you're with-holding secrets from her, not only are you not telling her something which may come back to haunt you if and when she finds out, but you're also proving you can't trust her. Isn't trust something you should have for someone who you seek a future together?

The best thing to think about this is to think of it in reverse. Let's say, hypothetically, she's keeping a big dark secret from you that you eventually find out either by accident, or some other reason. What would your reaction be? Would you be shocked? Would you accept it? Would it depend on what it is?
... Now you just have to realize that you keeping something from her is the same thing here. While it is true that you don't know what she'll do when you tell her, it'll no doubt be a lot better off than her finding out some other way, and then confronting you about it.
... I am maybe over-exaggerating a little, but I'm someone who believes that trust is one of the first steps to being together. And if you can't trust her enough to tell her your secrets, regardless of what they are, then it's clear you're not ready to be together or be in a serious relationship yet.
