I know your pain, Baron. I'm 18 and living with my parents. My mom has /no/ respect for privacy. I have caught her going through the files on my laptop, and even come home to find her in my closet for no good reason. When I ask her to please stay out of my room when I'm not home, and to not be on my laptop she says "It's my house." or "Is there something you don't want me to find?" Obviously, I wouldn't tell her "Yes, I'm hiding handcuffs (when I get some, that is)", so I'd have to say I'm not hiding anything, and she responds "Then, there should be nothing wrong with me cleaning your closet"
Similar issue with my "personal" laptop. Apparently the password isn't a big enough hint to STAY OUT. (she makes me type it in, claiming she bought the laptop, so she can take it from me if she wants)
At the moment, I'm using non-suspicious house items, like belts and shoelaces. I discovered that if you take the bottom dresser drawer out on my dresser, there's some room in there. When I buy handcuffs and other obvious bondage items, I intend to keep them in there.
Sorry about my complaning mini-rant about my mom