The essential feature of the sexual dysfunctions is inhibition in one or more of the phases, including disturbance in the subjective sense of pleasure or desire or in the objective performance. Either type of disturbance can occur alone or in combination. They can be lifelong or acquired, generalized or situational, and result from psychological factors, physiological factors, or combined factors. Sexual disorders can lead to or result from relational problems, and patients invariably develop an increasing fear of failure and self-consciousness about their sexual performance. Sexual dysfunctions are frequently associated with other mental disorders, such as depressive disorders, anxiety disorders and personality disorders etc. Sexual function can be adversely affected by stress of any kind, by emotional disorders, or by ignorance of sexual function and physiology. The dysfunction may be lifelong or acquired that is, it can develop after a period of normal functioning. The dysfunction may be generalized or limited to a specific partner or a certain situation.
Persistent or recurrent deficient (or absent) sexual fantasies and desire for sexual activity. The judgment of deficiency or absence is made by the clinician, taking into account factors that affect sexual functioning, such as age and the context of the person's life. Abstinence from sex for a prolonged period sometimes results in suppression of sexual impulses. Loss of desire may also be an expression of hostility to a partner or the sign of a deteriorating relationship. In one study of young married couples who ceased having sexual relations for 2 months, marital discord was the reason most frequently given for the cessation or inhibition of sexual activity. Increased prolactin can also be a reason again which can be treated. Sexual desire commonly decreases after major illness or surgery, particularly when the body image is affected after such procedures as mastectomy, ileostomy, hysterectomy, and prostatectomy. Illnesses that deplete a person's energy, chronic conditions that require physical and psychological adaptation, and serious illnesses that can cause a person to become depressed can all markedly lessen sexual desire in both men and women. A recent study found markedly lower levels of serum testosterone in men complaining of low desire than in normal controls in a sleep-laboratory situation. Drugs that depress the central nervous system (CNS) or decrease testosterone production can decrease desire.
Persistent or recurrent extreme aversion to, and avoidance of, all (or almost all) genital sexual contact with a sexual partner, characterized by an aversion to, and avoidance of, genital sexual contact with a sexual partner or by masturbation. Various previous bad experience and underlying fear/ anxiety maybe responsible for such situation. They have to be assessed and treated accordingly.