The testes are located outside the abdominal cavity in the scrotum because sperm formation requires a lower temperature than the normal body temperature. This arrangement helps maintain the optimal temperature for spermatogenesis.

The male reproductive system consists of portions responsible for producing germ-cells (sperms) and other portions that deliver these germ-cells to the site of fertilization.

Mammals, including humans, require specialized organs for the sexual act because the transfer of germ-cells between two individuals is essential for sexual reproduction. In mammals, the development of organs like the erect penis is crucial for successful mating, while the ...

Changes during puberty, such as new hair-growth patterns, serve as signals indicating that sexual maturation is occurring in animals. These signals help individuals identify the readiness of others for the process of mating.

The changes during puberty are linked to the reproductive process, particularly in organisms with a sexual mode of reproduction. They include signals of sexual maturation and the development of specialized organs necessary for the transfer of germ-cells between individuals.