I agree with jo_thorne, but I'm a pretty forward woman; if something hurts or is uncomfortable in bed then I say so right away. Sex is way too personal and intimate for me to be engaging in something that isn't pleasing or that I don't at least agree to do. I absolutely feel that it should be discussed. I feel like many men would be more hurt that they were kept in the dark about hurting you--most men, aside from having a great experience, really want to please their significant other and to make their experience pleasurable, not traumatic or painful.