Primary sex characteristic

A primary sex characteristic is an attribute of puberty that is directly related to sexual reproduction, in contrast to secondary sex characteristics. These characteristics of adolescents' bodies enable the maturity of sex organs and the development of gametes.

Primary sex characteristics are determined by the hormones that develop within an organism. Estrogens produce estradiol, which is released by the ovaries, and androgens produce testosterone, which is released by the testes. Despite both sexes possessing estrogen and androgen, it is the abundance of estradiol or testosterone that changes the individual.

In humans

There are two primary sex characteristics for both males and females that aid in the development of the reproductive system.

Males

• Maturation of sex organs
• Development of sperm

Females

• Maturation of sex organs
• Start of menstruation

See also

• Secondary sex characteristic
• Puberty