:Because if there is a more general category of "Furries" that doesn't involve sex, then this article must lay that down as the foundation, otherwise this article just becomes a discussion of something out of the ordinary (which on it's own is an emphasis that it must be perverted).  Discussions of something out of the ordinary without laying down the foundation will quickly turn into speculation and tripe, and will just be more fodder for trolls, rather than a level-headed reference.