ozomen

An aphrodisiac is a substance which is used in the belief that it increases sexual desire. The name comes from Aphrodite, the Greek goddess of sensuality. Throughout history, many foods, drinks, and behaviors have had a reputation for making sex more attainable and/or pleasurable. However, from a historical and scientific standpoint, the alleged results may have been mainly due to mere belief by their users that they would be effective (i.e., the placebo effect). In particular, medical science has not substantiated claims that any particular food increases sexual desire or performance.

A rhinoceros horn, falsely believed by some to have aphrodisiac properties. (In fact, however, the particular Chinese medicine shown in the picture is not an aphrodisiac but an antipyretic.)
Some aphrodisiacs gain their reputation from the principles of sympathetic magic, for example oysters, due to their shape. The same factor explains the trade in the phallic-looking horn of the rhinoceros, a trade which is seriously endangering the animal. Other animal-based aphrodisiacs gain their reputation from the apparent virility or aggressiveness of the animal source, such as tiger penis (a reputation which is similarly endangering to that species).