Read this review in the Friday Trib - there's a picture of the exhibit in question, with video (I think) of couples tickling each other. The picture isn't too clear but for those in Chicago it might be something to check out
http://www.chicagotribune.com/entertainment/custom/friday/chi-0503040371mar04,1,3176793.story
http://www.chicagotribune.com/entertainment/custom/friday/chi-0503040371mar04,1,3176793.story