Skin is just tissue and tissue wrapped around body, keeping its contents from going this way and that. (It's also really painful to walk with no barrier between the Earth and the sinew and bones of your feet.) Think of when you see a woman, and your belly just yearns, and you feel like you are going to throw up, like something is actually thrashing inside of you, trying to find escape, or when you're with that women, and that thrashing subsides to manipulation, and organs begin to move of their own accord: lips upon lips, and hips upon hips; beasts ravaging and ravishing until they find escape.