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Normal Sexuality

A person’s sexual attraction to another, and the passion and love that follows are deeply associated with intimate happiness which is determined by anatomy, physiology, living style, relationship with the other person and developmental experiences throughout life. Normal sexual behaviour brings pleasure to oneself and one’s partner, involves stimulation of the primary sex organs including coitus; it is devoid of inappropriate feelings of guilt or anxiety and is not compulsive.

The surface of the brain is involved in controlling both sexual impulses and processing of sexual stimuli that may lead to sexual activity. In studies of young men, some areas of the brain have been found to be more active during sexual stimulation than others.

Many neurotransmitters (chemicals in the brain: dopamine, epinephrine, norepinephrine, and serotonin) are produced in the brain and affect sexual function. For example, an increase in dopamine is presumed to increase libido. Serotonin, produced in the upper pons and midbrain, exerts an inhibitory effect on sexual function. Oxytocin is released with orgasm and is believed to reinforce pleasurable activities. Sexual arousal and climax are ultimately organized at the spinal level. Sensory stimuli related to sexual function are conveyed via various nerves like the pudendal, pelvic, and hypogastric nerves.

estosterone increases libido in both men and women, although estrogen is a key factor in the lubrication involved in female arousal and may increase sensitivity in the woman to stimulation. Progesterone mildly depresses desire in men and women as do excessive prolactin and cortisol. Oxytocin is involved in pleasurable sensations during sex and is found in higher levels in men and women following orgasm.

Arousal is triggered by both psychological and physical stimuli; levels of tension are experienced both physiologically and emotionally; and, with orgasm, normally a subjective perception of a peak of physical reaction and release occurs. Psychosexual development, psychological attitudes toward sexuality, and attitudes toward one’s sexual partner are directly involved with, and affect, the physiology of human sexual response. Every normal human being has four-phase sexual response cycle.

The classification of the desire (or appetitive) phase, which is distinct from any phase identified solely through physiology. Desire reflects the psychiatric concern with motivation towards sexual activity. This phase is characterized by sexual fantasies and the desire to have sexual activity.

The excitement and arousal phase, brought on by psychological stimulation (fantasy or the presence of a love object) or physiological stimulation (stroking or kissing) or a combination of the two, consists of a subjective sense of pleasure. During this phase, penile tumescence leads to erection in men and vaginal lubrication occurs in women. Various other changes occur in different parts of the body. Voluntary contractions of large muscle groups occur, heartbeat and respiration rates increase, and blood pressure rises. Heightened excitement lasts from 30 seconds to several minutes.

The orgasm phase consists of a peaking of sexual pleasure, with the release of sexual tension and the rhythmic contraction of the perineal muscles and the pelvic reproductive organs. A subjective sense of ejaculatory inevitability triggers men’s orgasms. The forceful emission of semen follows. The male orgasm is also associated with four to five rhythmic spasms of the prostate, seminal vesicles, vas, and urethra. In women, orgasm is characterized by 3 to 15 involuntary contractions of the lower third of the vagina and by strong sustained contractions of the uterus, flowing from the fundus downward to the cervix. Both men and women have involuntary contractions of the internal and external anal sphincters. Other manifestations include voluntary and involuntary movements of the large muscle groups, including facial grimacing and carpopedal spasm. Blood pressure rises 20 to 40 mm (both systolic and diastolic), and the heart rate increases up to 160 beats per minute. Orgasm lasts from 3 to 25 seconds and is associated with a slight clouding of consciousness.

Resolution consists of the disgorgement of blood from the genitalia (detumescence), which brings the body back to its resting state. If orgasm occurs, resolution is rapid and is characterized by a subjective sense of well-being, general relaxation, and muscular relaxation. If orgasm does not occur, resolution may take from 2 to 6 hours and may be associated with irritability and discomfort. After orgasm, men have a refractory period that may last from several minutes to many hours; in that period they cannot be stimulated to further orgasm. Women do not have a refractory period and are capable of multiple and successive orgasms.

Masturbation is usually a normal precursor of object-related sexual behaviour. No other form of sexual activity has been more frequently discussed, more roundly condemned, and more universally practiced than masturbation. With the approach of puberty, the upsurge of sex hormones, and the development of secondary sex characteristics, sexual curiosity intensifies, and masturbation increases. Adolescents are physically capable of coitus and orgasm, but are usually inhibited by social restraints. The dual and often conflicting pressures of establishing their sexual identities and controlling their sexual impulses produce a strong physiological sexual tension in teenagers that demands release, and masturbation is a normal way to reduce sexual tensions.
Moral taboos against masturbation have generated myths that masturbation causes mental illness or decreased sexual potency. No scientific evidence supports such claims. Masturbation is a psychopathological symptom only when it becomes a compulsion beyond a person’s willful control.Then, it is a symptom of emotional disturbance, not because it is sexual but because it is compulsive. Masturbation is probably a universal aspect of psychosexual development and, in most cases, it is adaptive.

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