In college, Whedon studied a theory called "womb envy", a concept he says observes "a fundamental thing that women have something men don't, the obvious being an ability to bear children. Men not only don't get what's important about what women are capable of, but in fact they fear it, and envy it, and want to throw stones at it, because it's the thing they can't have." In 2007, Whedon expressed his outrage over the murder of Du'a Khalil Aswad, and because the act was caught on video, was prompted to attack the underlying attitude he felt led to the murder, comparing the video to torture porn.