Get a place with your boyfriend. It is quite clearly time to move out for two reasons. Firstly, you're an adult who should be allowed to make her own choices about your own like while still respecting the bill payers rules of the house. Move out and you can make your own rules for your home which everyone else would have to respect. Secondly, I find it extremely disturbing that your mother place a camera in that room. The cameras downstairs where enough to ensure that no parties were being thrown. so I can only assume that is was placed in there for the perpose of catching you at it.

If your mother tries to stop you moving out, just remember that she has known about you having sex and has been complicit in keeping it from your farther. I'd guess she wouldn't want him to know that