Abstract
12 5½-yr.-o!d rhesus monkeys, 6 of each sex, were reunited with other-sexed peers with which they had been paired for 6 mo. during early adolescence. Responses of Ss to reunion with familiar animals were compared with their responses to pairing with unfamiliar other-sexed peers. The members of familiar pairs had been separated for nearly 2 yr. prior to the reunion described here. Familiar animals never aggressed one another, but males aggressed unfamiliar females. Ss directed more threats toward unfamiliar than familiar animals. Males mounted familiar females more often than unfamiliar ones, but it was apparent that heterosexual attractiveness in general was not based exclusively on familiarity.