Alan Cumming once confessed that he had dabbled in a little monkey business on the set of the 1997 film Buddy (starring Rene Russo as a woman who raises a gorilla as a son). Though his co-star was terrified of the chimps on the set, Cumming was "so curious about what it would be like to French kiss a chimp that I convinced one of the handlers to take me and a couple of the other actors into the pen after hours and let us smooch with them."
Cumming's conclusions? "French kissing a monkey is very different than kissing a human because they have gigantic wet tongues, which are also very rough. It's like soggy sandpaper."