I wouldn't even say that tickling was a fetish for me, and it really isn't
sexual, either. There are plenty of other things I like when it does
come to sensual or sexual behaviour, though I'm afraid that most of them
are rather ordinary. I like biting necks, nibbling on ears, nice asses
(by strictly my own definition, but I prefer them high, firm, and with 
dimples on the sides) and running my hands/nails over someone else, 
as long as they respond. For me, in almost anything I do with another
person, their reaction or response to what I do is key, whether or not
I find that their response strikes a sexual chord inside of me. 
I do occasionally have a situational response, like to elevators...
Lee