Why does my cat twitch and run? My 7 year old female cat has suddenly started twitching her back, running around, stops, grooms herself, and starts running again. I have her on a flea treatment and my other two cats don't do this at all. She only calms down if I pet her or she gets in her basket.
Psychological Causes. The most common causes of low libido in women are not due to physical or biological causes. Psychological causes like poor body image, low self-esteem, depression, stress and physical or sexual abuse are among the top reasons why women have low sex drive.
Men make estrogen from testosterone, and women do, too, Finkelstein said. So when men age and testosterone levels naturally decline, men also experience a drop in levels of estrogen circulating in their blood. The new results suggest that when estrogen levels drop, men experience some of the same consequences that women do after menopause: They have more bone loss, their libido declines, and they gain more fat around their midsection. [Macho Man: 10 Wild Facts About the Male Body]