Masturbation is a normal natural part of life and a release. There should be no shame in that act. Men and Women both do it... Looking at porn isn't a problem either. But, sometimes women with a partner do not understand this, or they get jellous of him - and will think, "Why does he need to do that? He should be doing that with me. Doesn't he like me? Aren't I enough for him?" Sort of thing... In reality it doesn't mean that at all, but she can take it that way.... It is nothing to be upset about. If she has a problem than it is her problem, which she has to work through. It's your body and you didn't do anything wrong. You can point out that she was the one that entered your room without knocking, and invaded your privacy. This is frequent topic on the program "Talk Sex With Sue" on TV, and alot of guys mention this issue.