Humans reproduce sexually. Reproduction in humans is in two parts:
Maturity of human sex organs begins with puberty, the name given to the changes that occur in boys and girls as they grow up. Mostly these changes occur between the age of 10 to 14 years, and these are brought about by certain hormones.
During puberty the body grows rapidly, and both primary and secondary reproductive organs grow and become mature. Along with these changes, secondary sex characters also start appearing. It is also to be noted that in males, sexual maturity is attained at the age of 13–14 years and in females, at the age of 11–13 years. Puberty ultimately leads to a stage when the child becomes an adolescent.
During adolescence, the secondary sexual characters that develop are as follows: