He may be the spitting image of George Clooney, but if being tied to the radiator with his belt makes you feel uncomfortable, or whipping him with a feather duster while telling him he’s a naughty schoolboy makes you feel stupid, then don’t do it!
Remember that you should never do anything you don’t want to and you have every right to refuse to put yourself in a humiliating or embarrassing situation. Not only will giving in not help your self-esteem, but it could lead him to expect the same next time, if there is one.