Final answer:
The first visible signs of puberty in boys are typically the growth of the testes, increased size and pigmentation of the scrotum, growth of the phallus, and subsequent hair growth in various body areas including underarms and the pubic region.
Step-by-step explanation:
First Visible Signs of Puberty in Boys
The first visible signs of puberty in boys typically start with the growth of the testes. This initial change is indicative of the onset of puberty. Subsequently, there's an increase in the size and pigmentation of the scrotum, followed by growth of the phallus. After these changes, boys will start to notice hair growth in various parts of their bodies, including the armpits, pubic region, chest, and, eventually, the face.
The deepening of the voice occurs as result of the growth and development of the larynx, and the first fertile ejaculations happen around the age of 15, but can vary from boy to boy. The male growth spurt usually happens later in puberty, between the ages of 11 to 13, with the potential increase in height of up to 4 inches per year. In some cases, the development associated with puberty can extend into the early 20s.