It most often develops in adults over the age of 40. It is also more common in women and in people with a family history. However, it can occur at any age due to injury or other joint-related diseases such as gout or rheumatoid arthritis. Now this is a very simple way to increase libido in women. According to a study, people experience an increase in their "dopamine" levels after looking at the photograph of their loved one for 30 seconds or more. Higher dopamine levels increase your desire to have sex. The primary sex organs inside female would be the ovaries. Ovaries produce the eggs (ova) and secrete sex hormones. These hormones are needed to build up secondary sexual characteristics and results in cyclic changes in the secondary sex organs which can be required for reproductive function.