I once told a girlfriend of mine, and that went really well - it turned out that she had had sex with a dog once and didn't tell anyone about it until I mentioned I was into dogs as well as humans. However, my most recent girlfriend and I had a horrible experience with the topic.
In the future I am going to try testing the waters first asking them what they think about it before exposing myself to a judgemental/shitty responses. Some also simply don't like it, and think it's wrong. If they had a hard time with it as painful as it might be I'd probably let the relationship go.
I'm curious
@Qwazycupcakes - what would you do if he was accepting of it, and what would you do if he wasn't?