Religion for Atheists and Promiscuity for Everyone

An Orange County billboard claims atheists make better lovers because they don’t have to worry about anybody watching. What is the actual message here and does it stand up to scrutiny?
The New York Times’ David Brooks reviews Alain de Botton’s new book Religion for Atheists.
Skeptics suggest that they have a better explanation of “spiritual” experiences than Christians do. Don and Brandon refer to Rudolph Otto’s The Idea of the Holy in taking a closer look at that claim.