Shigeru Miyamoto wrote:

When pornography escalates, it eventually crosses into the grotesque. I think the world of "hidden secrets" in games has almost reached that same grotesque level. It's reached a point where it isn't measured by common sense anymore. It's just people getting bored and looking for stronger and stronger stimulation. We've hit a wall. When you're at the point where you have no choice but to go "grotesque," you have to start thinking of new ways to use the medium.