The number of women regularly having sex declines with age and the number of women enjoying sex post-menopause is even lower, according to the study published in "Menopause: The Journal of the North American Menopause Society".
The study examined how intimate relationships, health and psychological factors affect sexual intimacy and satisfaction in post-menopausal women.
"Sexual health challenges are common in women as they age, and partner factors play a prominent role in women's sexual activity and satisfaction," said Stephanie Faubion, Medical Director at the North American Menopause Society.
"In addition, menopause-related problems such as vaginal dryness and pain with sex have been identified which affect sexual function, yet few women seek treatment for these issues despite the availability of effective therapies," Faubion said.
The researchers studied how and why a woman's libido and level of sexual satisfaction decline during and after menopause.
For the study, substantial research was conducted into biological reasons such as hot flashes, sleep disruption, vaginal dryness and painful intercourse.
But, much less is known about the effect of various psycho social changes that are common in post-menopause. These include body image concerns, self-confidence and perceived desirability, stress, mood changes and relationship issues.
A data of nearly 4,500 post-menopausal women involved in the UK Collaborative Trial of Ovarian Cancer Screening was studied and the findings showed that, before the start of annual screening, approximately half of the women were sexually active.
A decrease in all aspects of sexual activity was observed over time -sexual activity was less frequent, not as pleasurable and more uncomfortable. The primary reason for absence of sexual activity was the lack of a partner, mainly because of widowhood.
Other commonly cited reasons for decreased activity included a partner's medical condition, a partner's sexual dysfunction, the woman's own physical health problems, and menopause-related symptoms.