In the week following ovulation, the testosterone level is the lowest and as a result women will experience less interest in sex.
Also, during the week following ovulation, progesterone levels increase, resulting in a woman experiencing difficulty achieving orgasm.
This cycle has been associated with changes in a woman's testosterone levels during the menstrual cycle.
Social factors, such as work and family, and internal psychological factors, such as personality and stress, can affect libido.
According to her, testosterone levels rise gradually from about the 24th day of a woman's menstrual cycle until ovulation on about the 14th day of the next cycle, and during this period the woman's desire for sex increases consistently.
The 13th day is generally the day with the highest testosterone levels.
Problems can arise from disparity of sexual desires between partners, or poor communication between partners of sexual needs and preferences.
It is the instinct energy or force, contained in what Freud called the id, the strictly unconscious structure of the psyche.