An aphrodisiac is a substance that increases sexual desire, sexual pleasure, or sexual behavior. Substances range from a variety of plants, spices, foods, and synthetic chemicals. Therefore, they can be classified by their chemical properties (i.e., substances that are natural and unnatural). Natural aphrodisiacs like alcohol are further classified into plant-based and non-plant-based substances. Unnatural aphrodisiacs like Ecstasy are classified as those that are manufactured to imitate a natural substance. Aphrodisiacs can also be classified by their type of effects (i.e., psychological or physiological). Aphrodisiacs that contain hallucinogenic properties like Bufo toad have psychological effects on a person that can increase sexual desire and sexual pleasure. Aphrodisiacs that contain smooth muscle relaxing properties like yohimbine have physiological effects on a person that can affect hormone levels and increase blood flow.
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