sexual response cycle in human(Part2). Couples(married only)

sexual response cycle in human(Part2)

 PHASE 2&3

Phase 2: Plateau

General characteristics of the plateau phase, which extends to the brink of orgasm, include the following:

    The changes begun in phase 1 are intensified.
    The vagina continues to swell from increased blood flow, and the vaginal walls turn a dark purple.
    The woman's clitoris becomes highly sensitive (may even be painful to touch) and retracts under the clitoral hood to avoid direct stimulation from the penis.
    The man's testicles are withdrawn up into the scrotum.
    Breathing, heart rate, and blood pressure continue to increase.
    Muscle spasms may begin in the feet, face, and hands.
    Muscle tension increases.

Phase 3: Orgasm

The orgasm is the climax of the sexual response cycle. It is the shortest of the phases and generally lasts only a few seconds. General characteristics of this phase include the following:

    Involuntary muscle contractions begin.
    Blood pressure, heart rate, and breathing are at their highest rates, with a rapid intake of oxygen.
    Muscles in the feet spasm.
    There is a sudden, forceful release of sexual tension.
    In women, the muscles of the vagina contract. The uterus also undergoes rhythmic contractions.
    In men, rhythmic contractions of the muscles at the base of the penis result in the ejaculation of semen.
    A rash, or "sex flush" may appear over the entire body.