“What pornographic literature does is precisely to drive a wedge between one's existence as a full human being and one's existence as a sexual beingwhile in ordinary life a healthy person is one who prevents such a gap from opening up. Normally we don't experience, at least don't wantto experience, our sexual fulfillment as distinct from or opposed to our personal fulfillment. But perhaps in part they are distinct, whetherwe like it or not.”