Erection is the most obvious sign of sexual excitement in men, but it is not the only change. Other genital organs also become congested. The man’s scrotum becomes swollen and his testicles increase in size and rise up towards his crutch. In women, as well as vaginal lubrication and congestion-swelling of the tissues which surround the vaginal entrance (the lips or labia), the lips open out to expose the vaginal entrance, and the vagina becomes congested, its colour deepening to a purplish-red. A woman’s clitoris (which is the equivalent of a penis) increases in size and length – the same reaction as occurs to the man’s penis, when sexually stimulated. In women (but less often in men), a sex flush appears on the breasts and upper abdomen. In both sexes the heart beats faster and the blood pressure edges upwards.
The second, or plateau, phase of the sexual response is a time during which sexual arousal and desire is intensified, and may ultimately reach the stage when orgasm is inevitable. In this phase all forms of stimuli can intensify sexual desire, but the strength of the desire may be diminished by extraneous factors. A knock at the door, an insistent telephone ringing, or a sudden noise can so reduce sexual tension that the man moves away from orgasm and his sexual tension may even dissipate.
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