okcupid is probably your best and only bet. you could try making a kink profile and just a normal one. Every girl I slept with from okc was kinky. Like, non-specific kinky. Like, they didn't mind if I slapped them or tickled them or anything really. I only have a normal profile. So, I don't talk about sex/kink related things on the main page, but through the questions I answer, you may learn that I am into tickling, and other things.
If you're looking for women that are specifically into tickling, just forget about that. Just find a kinky submissive chick and you'll be good.