In Greek mythology, the Gargareans (or Gargarenses) were an all-male tribe. They had sex with the Amazons annually in order to keep both tribes reproductive. Varying accounts suggest that they may have been kidnapped, raped, and murdered for this purpose, or that they may have had relations willingly. The Amazons kept the female babies they produced and raised them as warriors and gave the males to the Gargareans. The bust of Zeus found at Otricoli (Sala Rotonda, Museo Pio-Clementino, Vatican) Greek mythology is the body of stories belonging to the ancient Greeks, concerning their gods and heroes, the nature of the world and their own cult and ritual practices. ... The Amazons ( Amazones) were an ancient nation of female warriors, or a society dominated by women, at the edges of Scythia in Sarmatia (Herodotus). ...
They originated from the area around the Caucasus Range and settled on the bank of the Thermodon River in Pontus, Asia Minor, and founded the town of Themiscyra on the coast of the Euxine (modern Terme in Sinop, on the Black Sea coast of Turkey).
For the continuation of the Amazon race, the women mated with the neighboring Gargarean men for a short period each year.
Another version of the myth tells of a number of men kept for mating purposes, but had the status of slaves, and were allowed to perform only those tasks executed in other countries by women.