Testes, present only in males and located in a scrotum sac between two thighs, produce the male sex hormone called testosterone. It controls the development of secondary sexual characters in male, such as
(1) deeping of voice
(2) the growth of hair on the face (beard and moustaches), armpits and around the genital organs
(3) enlargement of genital organs size
(4) the shaping of the male body, with general angular contours, typical of adults.
