Testosterone, an essential precursor of estrogen in women, is made in the ovaries and adrenal glands. There is a steady decline in testosterone levels from the 20s through menopause. With surgical menopause, the level of testosterone drops precipitously. No clear lower limit of testosterone has been established; however 15 ng per dL ( nmol per L) commonly is used. One study 38 found that women with 0 to 10 ng per dL (0 to nmol per L) had markedly decreased sexual desire in all situations and absent or markedly decreased orgasms. Because of studies like this, supplemented with anecdotal evidence, many women have been started on testosterone therapy.
And there are benefits to that outside of the sheer fact that you'll have more friends and those friends will like you more. "We know that men and women with social support have much better health, overall, while testosterone affects risks for depression, cardiovascular disease, obesity and some cancers," Gettler said.
So, as you get older and your testosterone levels naturally start to decrease, take solace in the fact that your social life will get a boost. If that's not all that exciting to you, make sure to keep exercising—a sure-fire way to keep levels in check, and consider talking to your doctor about new testosterone replacement methods that won't mess with your fertility.