Heard about one on CBC ... some dippy broad has been granted mega bucks to study how primates respond to being tickled ... she doesn't actually do the tickling herself; graduate students (in what I don't know) do the actual tickling ... evidently, many of the primates who are tickled become sexually aroused .... go figure, eh.
Perhaps when the research is done, they will release a DVD, perhaps entitled "Horny Apes": it could be made available thru your local adult movie store .... free banana shaped dildo to the first 1000 customers