Sex - Basic Aspects of Human Sexuality

The Role of Hormones

Testosterone: Too little or too much?
Hormonal imbalances can lead to physical changes in adults, too. Examples: Growth of a beard in women, development of breasts in men. In either sex, a lack of testosterone can - but does not have to - lead to a lack of sexual desire. A very high level of testosterone may contribute to aggressiveness and increased sexual activity. However, it seems that psychosocial factors play a more important role in this regard.

Average curve of testosterone levels in males from childhood to late adulthood (years 0...60) mg/l of androsterone in plasma