The main role of testosterone in the male body includes regulating various physiological functions, including the development of male secondary sexual characteristics such as increased muscle mass, deeper voice, and body hair during puberty. It is also essential for maintaining libido, sperm production, and overall reproductive health in males. Additionally, testosterone influences bone density and fat distribution. Its production occurs primarily in the testes, and any imbalance in levels can lead to health issues, affecting not just physical attributes but also mood and energy levels.