Heart Disease Recent research demonstrates that the role of testosterone goes far deeper than making men masculine. In both men and women, testosterone increases the desire for sexual activity. Although estrogen can also have a libido-enhancing effect, testosterone's effect is usually far greater. A recent study has shown that women with osteoporosis who took a combination of estrogen and testosterone increased their bone density, an effect previously demonstrated only with progesterone. A recent study has shown that women with osteoporosis who took a combination of estrogen and testosterone increased their bone density, an effect previously demonstrated only with progesterone.
All men experience a gradual reduction of testosterone levels.
Testosterone is the primary male sex hormone that influences physical vitality, development and maintenance of muscle mass, libido, erectile function and sperm production. For men in their forties, the decrease is so small that it is almost imperceptible. The decreased levels start to become noticeable in the fifth or sixth decade of life. As many as 60 percent of men over the age of fifty-five suffer some recognizable decrease in physical vitality, strength, and sexual prowess due to testosterone deficiency. Muscle weakness and shrinkage Decrease in vigor and aggressiveness Decrease in sexual desire Decrease in sexual activity Inability to develop and maintain penile erection for sexual intercourse.