It's not so much tickle torture, but I have this game I've played with a male friend for a few years now. We're both 20, and whenever we are round eachother's house we tend to mainly play Xbox, games like Halo or Call of Duty or whatever. I count up how many times he kills me in the games throughout the day, and then before I leave he has to withstand being tickled for that many seconds. I only really tickle his stomach though, as that is genuinely the only place he is ticklish.
We've had that game for about two years now, and it's always fun, with nothing sexual involved, it's just for a laugh and then we carry on talking afterwards like normal.