Some phenomena occur in with the human psyche that are unexplainable.
But you catch my drift nonetheless. So naturally we try to get as many pictures of them as possible. The Iron Cat calendar made for Katsucon has an entire shot of about two dozen catgirls. Guys love it, girls eat it up because they know we're dreaming about and fantasizing of it. There has to be some explanation on a psychological level, but I'll be damned if I know what it is.