Right from the page Nishbuk posted.....
Do women have testosterone?
Yes, women have testosterone also. Men produce this hormone in the testes (testicles) and adrenal glands and women produce testosterone in the ovaries and adrenal glands. Men produce much much more. The average healthy man secretes about 260 to 1,000 nanograms of testosterone per deciliter of blood plasma. Women produce about 15 to 70. In teenage boys, the level could be as high as 2000 nanograms, which explains their sexual drive and how they behave. After the age of 30, the production of testosterone gradually tapers.