Sexually explicit images are among the oldest known representational artifacts, and yet none of these were ever understood as “pornography” until the word and concept began to emerge in Western European languages during the 19th century. At that time, it was used equally to refer to written texts and visual representations. The word has since entered into much more widespread usage, often referring to any and all sexually explicit material, more often to material that appears specifically designed “to stimulate erotic rather than aesthetic feelings” (Oxford English Dictionary). Since the popularization of internet pornography in the late 20th century, the term has even come to be applied to any image considered to emphasize the pleasure and seduction of the viewer over realistic representation (as in “food porn,” “real estate porn,” etc.). Many attempts have been made to define pornography more specifically, but little consensus has been achieved. Courts of law have generally avoided defining the word “pornography,” preferring to categorize sexually explicit or arousing representations in terms of “obscenity.” Feminist scholars have disagreed on the definition of pornography to the extent that the conflict became known as the “Porn Wars” of the last several decades of the 20th century. Sexually explicit or sexually stimulating representations can elicit powerful emotional responses that vary widely, and they are inextricable from questions of social power. Thus, the very act of defining pornography is implicated in political struggles over some of the most fundamental issues of human life: gender, sexuality, social equality, and the nature and power of representations. There remains no general or stable agreement concerning what it is, what effects it may have, or even whether it exists at all.