"A new study has linked porn or sexualized media watching to motivation. The study, published on JAMA Network, sought to identify whether frequent viewing of pornography is associated with the frontostriatal network."
http://au.ibtimes.com/articles/554219/20140530/sexual-material-adult-films-content-sex-pornography.htm#.U4g83yj4JQA
http://www.dailymail.co.uk/sciencetech/article-2642712/Does-watching-porn-make-LAZY-X-rated-content-shrink-region-brain-linked-motivation-study-claims.html
http://au.ibtimes.com/articles/554219/20140530/sexual-material-adult-films-content-sex-pornography.htm#.U4g83yj4JQA
http://www.dailymail.co.uk/sciencetech/article-2642712/Does-watching-porn-make-LAZY-X-rated-content-shrink-region-brain-linked-motivation-study-claims.html