Findings from a first-of-its-kind study by Indiana University researchers confirm anecdotal evidence that exercise -- absent sex or fantasies -- can lead to female orgasm.

Nearly one out of every four adults between the ages of 45 and 65 are unhappy with their sex lives.

An Indiana University study involving 2,453 women ages 18 to 68 found that lubricant use during sexual activity alone or with a partner contributed to higher ratings of pleasurable and satisfying sex.

An Indiana University study published in the September issue of the International Journal of Sexual Health found that women who feel more positively about women's genitals find it easier to orgasm and are more likely to engage in sexual health promoting behaviors, such as having regular gynecological exams or performing vulvar self-examinations.

Women who feel comfortable and positive about female genitals find it easier to orgasm, U.S.