text: Yes, it's an invasion of privacy.\nPresumably you may/may not be at least partially undressed in some (or if not now, may be in the future). For all you know he's posting these on the web, sending them to his pals, etc.\n\nReact, don't just use words.\nNext time he denies it and won't show you (to prove), just act p*s*ed off, walk away from him and don't contact him for a few hours/days (depending on your closeness at the moment).\n\nHe'll keep doing it unless there's some real comeback which affects him.\nAlternatively you could start breaking his stuff - but using softer methods is safer to start with.