aphrodisiac

n. Generally mythical agent which stimulates sexual desire; no genuine aphrodisiac has been found. Most folk aphrodisiacs such as oysters, raw eggs, yohimbine, and rhinoceros horn have no measurable aphrodisiac power. Modern drugs such as Cialis and Viagra increase blood flow to the sexual organs, making sexual arousal more likely with stimulation, but do not affect sexual interest or arousal directly. Spanish fly causes irritation to the urinary lining, giving rise to desire to scratch, which can be mistaken for sexual desire. Alcohol lowers inhibitions to sexual activity but also makes sexual performance more difficult. The ergot alkaloids in nutmeg bring about sexual desire along with visual distortions but are also toxic and cause vomiting, and no systematic studies have been undertaken on these substances. Marijuana usually causes a greater focus on sensory input, which can enhance sexual experience. Empathogens such as Ecstasy bring about feelings of closeness but do not directly enhance sexual arousal.