What are hormones?

Hormones are managed by the bodies endocrine system. The endocrine system responds to the bodies need to replace damaged and depleted cells. Various glands throughout the body produce hormones when the endocrine system signals that these cells should be produced.
Sex hormones play a vital role during sexual activity, in fertility, and in child-bearing. The testes are central to sex hormone activity in genetics males just as the ovaries are for genetic females. Sex hormones travel through the bloodstream to indicate whether the body should follow a male or female pattern of development. Sex hormones in females may indicate that the body should develop breast tissue. In males, sex hormones may indicate that the body should develop more muscle and hair.
Genetics plays a central role in our bodies physical development. The body is genetically programmed to develop in a pattern that is consistent with its blood relatives. In this way, sex hormones connect physical growth to a recognizable pattern created by our genetic ancestors.  For example, a person may have blue eyes because they were born to a Caucasian ancestry where a relative passed them the gene for blue eyes.