The way I look at it, the key question to determine appropriateness of mentioning your tickling fetish is simply this: Is this person someone with whom it would make sense to discuss the general subject of your sex life and what turns you on? After all, what you're telling the other person is that tickling gives you a sexual arousal, kind of like saying "I get hot every time my boyfriend puts on his cologne" or "every time he picks me up in the air and starts bouncing me." Some relationships are conducive to that kind of sharing, others not. But in my opinion, that's the category it's in. And in this instance, from your description, it didn't sound as if anything was lost. Where the average person would think it's weird, by the way, is when you get to the part about belonging to an international cyber community that holds annual conventions to which people travel long distances to tie each other to bondage equipment to be tickled, howling in agony for half an hour or more at a time and then coming back for more. NEST would be weird to the average person. The mere idea of getting turned on by getting tickled by one's boyfriend--that's just another form of foreplay.