Freud developed the idea of a series of developmental phases in which the libido fixates on different erogenous zones—first in the oral stage (exemplified by an infant's pleasure in nursing), then in the anal stage (exemplified by a toddler's pleasure in controlling his or her bowels), then in the phallic stage, through a latency stage in which the libido is dormant, to its reemergence at puberty in the genital stage.Freud pointed out that these libidinal drives can conflict with the conventions of civilised behavior, represented in the psyche by the superego.
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.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.
According to Gabrielle Lichterman, testosterone levels have a direct impact on a woman's interest in sex.
A person may have a desire for sex, but not have the opportunity to act on that desire, or may on personal, moral or religious reasons refrain from acting on the urge.
Psychologically, a person's urge can be repressed or sublimated.
Although some specialists disagree with this theory, menopause is still considered by the majority a factor that can cause decreased sex desire in women.
The levels of estrogen decrease at menopause and this usually causes a lower interest in sex and vaginal dryness which makes intercourse painful.
Failure to adequately adapt to the demands of these different stages could result in libidinal energy becoming 'dammed up' or fixated in these stages, producing certain pathological character traits in adulthood.