Strong Bodybuilding Man Portrait

There is an extensive debate about how children develop gender identities.
In many cultures displaying characteristics not typical to one's gender may become a social problem for the individual. Among men, some non-standard behaviors may be considered a sign of homosexuality, while a girl who exhibits masculine behavior is more frequently dismissed as a "tomboy". Within sociology such labeling and conditioning is known as gender assumptions and is a part of socialization to better match a culture's mores. The corresponding social condemnation of excessive masculinity may be expressed in terms such as "machismo" or "testosterone poisoning."
The relative importance of the roles of socialization and genetics in the development of masculinity continues to be debated. While social conditioning obviously plays a role, it can also be observed that certain aspects of the masculine identity exist in almost all human cultures.
The historical development of gender role is addressed by such fields as behavioral genetics, evolutionary psychology, human ecology and sociobiology. All human cultures seem to encourage the development of gender roles, through literature, costume and song. Some examples of this might include the epics of Homer, the King Arthur tales in English, the normative commentaries of Confucius or biographical studies of the prophet Muhammad. More specialized treatments of masculinity may be found in works such as the Bhagavad Gita or bushido's Hagakure.