Some claim they have sex for love, because they're horny, or to fulfill a basic physical need. Darwin theorized that the primary motivation behind sex is to propagate one's genes, or to gain status and resources. However, these common assumptions largely ignore some of the darker reasons we have sex, which are surprisingly similar to the Christian's seven deadly sins.
Guilt: Guilty sex is popular with both sexes, especially of the long-term-relationship variety. Cheating spouses actual have sex with their partners
This article appears in Jul 8-14, 2010.
