Researchers from Stanford discover that touching the areas where a robot’s genitals or buttocks would be provokes a physiological response in humans. They challenged volunteers with a robotic creature less than two feet high that possessed eyes, ears, torso, legs, arms and a voice – and a chat-up line rich in come-hither invitations, asking volunteers to point to or touch its body. It was found that a touch where the robot's buttocks or private parts would be produced a measurable response of arousal in the volunteer human. https://www.theguardian.com/technology/2016/apr/05/touching-robots-can-arouse-humans-study-finds
