Aphrodisiacs are substances that arouse sexual desire or enhance sexual performance. For many centuries there has been a search for substances that could increase a person's sexual powers or desire.

Among the many substances that have been claimed to have such an effect are oysters, ginseng root, powdered rhinoceros horn, animal testicles, and turtles' eggs. There is no evidence that an actual aphrodisiac response occurs with these or any other substances.

Just how certain foods or other substances come to be seen as aphrodisiacs is typically a matter of folklore rather than fact. In some cases the newness or rarity of a food or chemical invite people to endow it with magical powers of a sexual nature.

In other instances, sexual strength is assumed to come from eating foods resembling a sex organ, such as bananas and oysters because of their vague resemblance to the penis and testicles. While the notion that the shape of an unrelated object should qualify it as an aphrodisiac seems absurd to most, people continue to view some foods as aphrodisiacs.