Studies have shown that the use of birth control pills leads to a long-term side effect of loss of libido.
Loss of Libido Research and Studies Articles

A recent study shows that women may experience a decreased loss of libido after hysterectomy, despite what earlier studies have said to the contrary.
A loss of libido is a common symptom of menopausal women and recent studies have shown that this symptom can be treated through hormone based treatments
Menopause can be a trying time for women on a psychological and emotional level. The fluctuating hormones brought on by menopause have caused women to compare this lack of control over their bodies to their teenage years
Research shows that by adding fava beans to a woman's diet, she may fight loss of libido that occurs naturally during menopause through the addition of dopamine in the body.
The testosterone patch for women has been rejected by the FDA as a suitable cure for loss of libido on grounds of safety issues.
Recent research suggests that low libido in postmenopausal women may effectively be treated with a testosterone patch. Loss of libido in menopausal women is thought to be related to low testosterone levels.
A study has shown that testosterone can treat loss of libido.