Hormones play an important role in regulating sexual function in women. With the decrease in the female hormone estrogen that is related to aging and menopause, many women experience some changes in sexual function as they age, including poor vaginal lubrication and decreased genital sensation. Research suggests that low levels of the male hormone testosterone also contribute to a decline in sexual arousal, genital sensation, and orgasm. Researchers are investigating the benefits of hormones and other medications, including drugs like Viagra, to treat sexual problems in women.