We all observe that the reality of sexual intercourse is far from perfect; yet this does not convince us that sex is a greatly overrated occupation. Every time a man glimpses a pretty girl pulling up her stocking, he catches a glimpse of what might be called the "primal sexual vision." It is unfortunate that there seems to be a certain disparity between this primal vision and most ordinary sexual experience. But it dances in front of us like a will-o'-the-wisp, luring us into tormented effort. It can lead novelists to write novels, poets to write poems, and musicians to write symphonies.