Walking barefoot is a lot like cuddling naked with someone you love. The intimacy of cuddling is closely connected to the vulnerability, both physical and emotional, to which the participants open themselves. At any moment, with just a swift jerk of the knee, your partner could send you doubling over in pain. And yet, despite all survival instincts to the contrary, you open yourself. You drop your defenses. You drift off to sleep, and the vulnerability is absolute.