Further enlargement and development of the scrotum and testis takes place and pubic hair thickens. Other changes involving the pubic hair include curling and coarsening in texture. These changes continue throughout the fourth stage accompanied by enlargement of the penile glans with thickening of hair in the pubic area. Stage five is the completion of sexual maturation. The penis, scrotum and testis are fully matured and are adult-sized.
Pubic hair fills the pubic area and extends onto the surface of the thighs and up the abdomen.
Increased body hair, voice changes and other physical changes are called the secondary sex characteristics of puberty. They are the consequence of changing hormone levels in the male body. Unlike ovaries, their female counterpart, the testis constantly manufacture their reproductive contribution, sperm. The process of sperm production is termed spermatogenesis. While a volume of sperm can be stored in a structure extending off of the testicle called the epididymis, at intervals, the stored sperm must be released as part of the normal physiological process to make room for the newly manufactured sperm.