This animal is in a defensive position and is not enjoying this 'tickling'. It secretes venom from its underarms which it combines with its saliva to deliver in a bite. This particular animal also had its teeth clipped to prevent biting. These are wild animals and not pets. See the following article for more info: http://www.onearth.org/articles/2013/09/hey-youtube-rihanna-stop-promoting-the-illegal-pet-trade-loris