Testosterone is a hormone produced by males in their testes and females in their ovaries and adrenal glands that helps produce red blood cells, muscles and bone density. It also affects libido and sperm production in men and menstruation in women. Testosterone tends to decline gradually in men after age 30 at about 1 percent per year, according to Mayo Clinic staff. Women going through menopause tend to lose testosterone more quickly. Lack of enough testosterone can have negative effects in both men and women.
Loss of Sex Drive
One effect of decreased testosterone in both men and women is a lowered sex drive. Men suffer from both erectile dysfunction and lowered sperm count, while women have less energy, vaginal lubrication and decrease in or absence of menstruation, according to urologychannel.com.
Underdeveloped Sex Organs
Gender blending from lack of testosterone in male congenital and childhood stages leads to underdeveloped sex organs. According to Mayo Clinic staff, sex organs may even be ambiguous--meaning they seem to be neither male nor female.
Delayed Puberty
Delayed puberty in both males and females is another effect of too little testosterone. Mayo Clinic staff say males tend to suffer from hypogonadism with decreased muscle mass, delayed voice deepening, little hair growth and underdeveloped sex organs. Females tend to be short, have undeveloped breasts and lack of menstruation, according to urologychannel.com.
Other Physical Effects
Other physical effects for both men and women from too little testosterone include weakness in bones and muscles, anemia, lethargy and insomnia, according to a Sept. 2007 Science Daily article.
Mood Alteration
Men with too little testosterone may experience depression and memory loss. According to Mayo Clinic staff, this may lead to mood alterations.
