Recently when a female friend of mine, someone I know from an artistic community and have done two enjoyable projects with over the past decade, let me give her a foot tickling. Actually, she said I could give her a pedicure which tickles, but once we got going, and once the rubbing of her callouses with the stone was done, she let me apply lotion and then just give her a pure tickling. We went on and off for about a half hour. The best part of it, or at least equal to the thrill of getting to tickle her, was the compliment to me of how much she trusted me and felt comfortable with me that way.