• Sexual problems occur in 43 percent of American women.

• Sexual problems occur in 31 percent of American men.

• About 10 percent of women have never had an orgasm.

• Painful intercourse has been experienced by almost two out of three women at some time in their lives.

• It is common for breast-feeding women to have inadequate vaginal lubrication.

• About 15 percent of postmenopausal women experience a decrease in their sexual desire.

• The success rate for women's orgasmic dysfunction treatment by sex therapists tends to range from 65 percent to 85 percent.

• About 22 percent of women experience low sexual desire (compared to 5 percent of men).

• Some 21 percent of men experience premature ejaculation.

• A woman's level of androgen (a hormone that develops and maintains masculine characteristics) typically falls 50 percent during and after menopause (but it's unclear whether the drop translates into decreased sex drive in a large percentage of women).

Sources: National Library of Medicine; National Women's Health Resource Center; Journal of the American Medical Association