Dubbed the "Asian Viagra, Tongkat Ali is used traditionally as a medicine by men to increase libido, sexual performance, impotence and to treat erectile dysfunction. It works by building the levels of the hormone testosterone which is primarily responsible for the growth and development of male reproductive organs, including the penis, testicles, scrotum, prostate, and seminal vesicles. Testosterone is not just a sexual stimulant for men. Women also produce testosterone, though in much smaller amount. This vital hormone also fans sexual desire and increases sensitivity in women's erogenous areas.