Two major theories have been proposed about the causes of sexual dimorphism.

◾️ The first theory suggests that the presence of steroid hormones directs the development of the brain to be either male or female by forming pathways within the brain that are required for the control and display of sex-specific behaviors.

◾️ The second theory suggesting that the influences of other individuals and one’s society during the formative childhood years may result in the development of stereotypical sexual behaviors.