The union between a male and a female does produce not only new offspring but also a whole journey of gender experience. Scholars have posed countless questions, hypotheses, and articles seeking answers, validations, and explanations to how and why gender differences exist. To answer these questions, the present study reviewed the social and biological theories on gender differences, seeking to unearth their perspectives on the origin of gender differences. From the review, the social theory postulated that the society, through its social structures, created gender difference as a way of ensuring the division of labour between men and women. The biological theory also maintained that gender differences are natural orders created by biologic...