What is the primary effect of testosterone in males?

The primary effect of testosterone in males is the development of male reproductive tissues and secondary sexual characteristics. Testosterone, which is produced predominantly in the testes, plays a pivotal role in the formation of male reproductive structures, such as the penis and prostate, during fetal development. It is also essential for the onset of puberty, leading to the maturation of these reproductive tissues and the development of secondary sexual characteristics such as increased body hair, deepening of the voice, and changes in fat distribution and muscle mass.

While testosterone does have other important roles, such as influencing bone density, metabolism, and mood, these are considered secondary effects relative to its primary role in male sexual development and differentiation. Understanding the fundamental functions of testosterone is crucial for recognizing its significance in male physiology and health.