I have at private gatherings, that much I recall.
I know I have asked a friend if so-and-so is ticklish; the friends have always been happy to acknowledge the ticklishness of their pal.
Oh my god, I HAVE done that, ha! I had a buddy, who - after this conversation, I would SWEAR is on this Forum - but maybe not. He was giving me a lift somewhere, and we're talking about whatever, and I asked him what he looked for in a girl...and he said...."she has to be ticklish." I could not believe my ears. "Really?" Hahaha. I should have said, "Me too!" But instead I said, "Why?" and he thought for a second...."I don't know....it's just fun!" Ha! So he had just broken up with his girlfriend, and I actually said "So Carol? She's....." and he said "Mmm-hmmmm."
Years later, I'm getting a lift from ANOTHER friend....and somehow he starts talking about something he's into, and he's expounding on it at length....and so, what the hell, come out of the closet, Leo! I start telling him what I'M into, and he's smiling, he gets it, and he had this girl, a total knockout brunette, model quality, I mean straight black hair and olive skin and the full lips and the whole thing, hurtfully pretty....that was an on again/off again thing for years. They had grown up together. She'd be on the scene for a while and then he'd have another girlfriend, and then she'd be back around...and this went on year after year. Anyways, I had to know....."....I always wondered if Sara was ticklish!" (not her real name)...and he laughed and said "Yes, very." I didn't push the issue, but I was almost hoping he'd say no, because if he'd said no, so I would never stammer in her presence again, lol!