Damiana is a small shrub with an aromatic leaf found on dry, sunny, rocky hillsides in south Texas, Southern California, Mexico, and Central America. The damiana leaf has been used as an aphrodisiac and to boost sexual potency by the native peoples of Mexico, including the Mayan Indians.

The two species used in herbal healing, both of which are referred to as damiana, are Turnera aphrodisiaca and Turnera diffusa. Passion Rx is a potent herbal sexual enhancement product that contains damiana extract along with 15 other effective herbs from all over the world.