The male sex hormone is a group of hormones that are responsible for the development of male characteristics. The two main hormones in this group are testosterone (12 letters) and ANDROGEN (8 letters). Testosterone is the primary male sex hormone and is responsible for the development of male reproductive organs, secondary sexual characteristics, and muscle mass. ANDROGEN is a hormone that is responsible for the development of male characteristics such as body hair, a deep voice, and increased muscle mass. Both hormones are essential for normal male development and reproductive function.