Just as men's bodies manufacture small amounts of estrogen, women's bodies produce testosterone through the ovaries and adrenal glands. A multitalented hormone, testosterone boosts both libido and energy, maintains muscle mass, strengthens bone and ensures the nipples and clitoris are sensitive to sexual pleasure.
As we age, our bodies produce less androgen (testosterone), estrogen and progesterone. By age 40, women produce about half the testosterone we did in our twenties. These levels drop further still with the onset of menopause or for women who have had their ovaries removed. Many clinicians believe that the diminished energy, decreased sexual desire and "flatness" of mood that some women experience during and after menopause are directly related to declining levels of testosterone.