n order to intensify the challenge to pair-bonding, we required both subjects to engage in bizarre fetishistic behavior. With Aiden now nude, silenced and bound hand and foot on a woden table, we again offered Lily the opportunity to leave the house. If she did so, Aiden's fate again would be uncertain; if she did not leave, however, we would order Lily tolick and suck Aiden's bare feet. Once again, Lily's loyalty to Aiden overcame the natural repugnance she must have felt as she mouthed Aiden's feet! No change in conclusion reached in 1).