Dr Darrel Ray is an organizational psychologist and author of two popular books, Sex & God (2012) and the God Virus (2009). He lives in Kansas, USA and is 62. He is also a prominent atheist; carrying extensive research into the relationships between sex and religion. He was raised a fundamentalist Christian.
See the below links for more information: http://en.m.wikipedia.org/wiki/Darrel_Ray#section_3