If you're not dying to have a roll in the hay every night, your first response should not be alarm. Everyone's natural libido is different, and it fluctuates based on the slightest changes in your body, mind or environment. You could have no libido at all and still be normal, as any asexual individual will tell you.

However, if a lack of desire or an inability to have sex is impeding your quality of life and causing you distress, you may be facing a form of female sexual dysfunction. This is a condition in which a woman has persistent problems with sexual response, desire, orgasm or pain during sex, according to the Mayo Clinic.

While estimates vary, up to 40 percent of women (some experts believe up to 50 percent) in the United States experience sexual dysfunction at some point in their life.

Identifying female sexual dysfunction