A study of young Australian women found that one-third had felt sad after sex at least once, and 10 percent "frequently or almost always" had after-sex sads. Obviously, further research will be needed to make sure that it's not just because these poor women were having sex with Australians; study author Robert Schweitzer of the Queensland Institute of Technology suggests that one reason for "postcoital dysphoria" may be "biological predisposition." Either way, let's hope these women can find a cure for their affliction and return to feeling the only appropriate postcoital emotion: Shame. [LiveScience; image via AP]