Related Experiment Video
Updated: Jul 12, 2026

Assessment of Social Interaction Behaviors
Published on: February 25, 2011
Homosexual behavior in a laboratory group of stumptail monkeys (Macaca arctoides): forms, contexts, and possible
Abstract:
Observations of stumptail monkeys revealed frequent prolonged, intensive genital stimulation between individuals of the same sex, both males and females, adults and infants. These homosexual interactions occurred in positive emotional contexts, were accompanied by positive emotional facial expressions, and often were evidently elictied by the observation of heterosexual behavior. Infants' first copulations were performed with adults of the same or opposite sex who actively aided them. This suggests that homosexual and heterosexual encounters function as training for adult sexual roles, and that homosexual behavior is a basic primate pattern not exclusive to man.
Related Concept Videos
Naturalistic Observations
The Stanford Prison Experiment
Relationship Formation
Causes of Social Behavior III: Biological and Environmental Influences
Amebiasis

