While the quest for a female Viagra continues, the secret switch that turns on desire is a kiss!  Kissing and cocaine both spark the same feel-good brain chemical, dopamine.  Male saliva contains testosterone, and a lingering kiss is a reliable delivery system. Smooching floods the bloodstream with dopamine, which stimulates the same part of the brain that cocaine does—for a natural high.

A new study by the Kinsey Institute for Research found that while men put a strong value on kissing and snuggling, women are more likely to stay in a sexually satisfying relationship.