What words does good sex bring to mind? Luscious, hot, beautiful, exciting... those are good words! But what about wicked, nasty, dirty... are those on your list of sex words? And isn't that interesting? Because those are not nice words.
But Water's remarks imply that sex without shame would necessarily be less fun--would lack the edge that shame gives it--and I'm not sure that's true. Shame, power, control, humiliation, are all ingredients that can make for a very sexy recipe. But let me suggest that these should be voluntarily added, a choice, like wearing a fur teddy or not, like deciding to play "prison shower," or not. There are other possibilities.
Try this: Masturbation is beautiful.