Damiana - Turnera diffusa. Damiana has been popularly used across the Southwestern United States and Mexico as an aphrodisiac and for asthma, bronchitis, neurosis, diabetes, dysentery, dyspepsia, headaches, paralysis, nephrosis, spermatorrhea, stomachache, and syphilis. Damiana is a popular aphrodisiac for men. The alkaloids contained within damiana stimulate blood flow to the genital area thereby increasing sensitivity; some even people report feelings of euphoria. Parts Used Leaf and leaf stems, dried.