Do your parents really trust you that little that they snoop around in every corner of your room? In any case I recommend you take a trip to your local hardware store and see if you can purchase a lock box and keep the key on you at all times. If your parents get suspicious from seeing a lock box and ask you what's inside, tell them it's "personal things". If they ask further, tell them it's got a penis pump, a vibrator, KY Jelly and a whole bunch of porn inside it and they won't pry any more.