Higher libido is referred as increased sexual desires and urges over the one´s normal libido. There is no widely accepted measure of what is a healthy level for sex desire. Some people want to have sex every day, or more than once a day; others once a year or not at all. 

Increased libido is caused by elevated levels of testosterone (hyperandrogenism) that have a direct impact on an interest in sex. It may be accompanied by increased desire for touching and sensuality, thinking about sex a good portion of the time, drawn out or repetitive fantasizing, and experimenting with sexual expression (sexting, new positions, more/different partners).

Higher libido is not the same as hypersexual disorder. Hypersexuality is marked by excess, intrusive thinking and risk-taking behavior resulting from high sexual appetite. People with hypersexual disorder may not even experience much pleasure in the sex, indulging in sexual thoughts and actions to assuage negative sensations rather than to experience pleasurable ones.

A woman's desire for sex is correlated to her menstrual cycle, with many women experiencing a heightened sexual desire in the several days immediately before ovulation, which is her peak fertility period, which normally occurs two days before until two days after the ovulation. This cycle has been associated with changes in a woman's testosterone levels during the menstrual cycle. In men, high testosterone level is associated with shorter reflactory period. 

Polycystic ovary syndrome

Polycystic ovary syndrome (PCOS) is characterized by ovulatory dysfunction, hyperandrogenism, and polycystic ovarian morphology (lots of tiny cysts). High testosterone level is also associated with low sex hormone binding globulin levels (SHBG), the protein that binds sex hormones in the blood. In low SHBG levels, sex hormones levels go up to double dose. Patients may have issues with increased libido, male pattern baldness, excessive hair growth, acne, and irregular menstruation.

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Sources

Polycystic Ovary Syndrome ―by Ramezani Tehrani and Behboudi-Gandevani licensed under CC BY 3.0
Hyperandrogenism ―sourced from Wikipedia licensed under CC BY-SA 3.0
Libido ―sourced from Wikipedia licensed under CC BY-SA 3.0
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