EVERY DAY!!! But that's because I'm soooo lucky now to be in a relationship with my absolute dream girl. She truly loves being tickled, and it is the hottest and most wonderful thing I've ever experienced.
No I'm not making this up. Nor did it come easily to me. For years and years I had no tickling at all, just pure fantasy. (The reason for my screen name, in fact.) But after my divorce I finally began pursuing the dream, and since then I've had the same split as above: single/no, attached/yes.
Most girls I dated still weren't interested. But I had a promising relationship last year that fell apart for vanilla reasons. And in retrospect I'm thrilled it did, because I kept trying and went on to hit the jackpot!
So guys, don't give up. Girls who love it really DO exist and eventually CAN be found!