1. The Erotic Engine: How Pornography has Powered Mass Communication, from Gutenberg to Google;Barss,2011
2. Sexual Deviance and Society: A Sociological Examination;Worthen,2016
3. Love and Sex with Robots: The Evolution of Human-Robot Relationships;Levy,2007
4. Lonely Men to Get Guide on Building a Sex Robothttp://www.thetimes.co.uk/article/lonely-men-to-get-guide-on-building-a-sex-robot-hn69zggs0