This is wonderful! It’s the sort of opportunity you couldn’t dream up on your own. If your mother’s going through your things, why not help her out? It might be expensive, but why not leave a bunch of condom wrappers in your trash can. When your mom questions you on it, tell her that you’ve decided to forego the use of condoms to relieve her of the anxiety. And don’t just leave “evidence” in your room. Buy up some cheap women’s panties, launder them, and after some sort of physical exertion, wipe your sweaty forehead with the things then “hide” them around the house. Just to make the point include a set of the largest pair of women’s drawers you can locate as well as something that would only fit a 10 year old.