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The orgasm is a pulsatile event with strong feelings of pleasure centred around the genitala and a demanding pushing feeling. In women this is usually indicated visibly by a series of contractions in the vaginal-anal area which occur at about once every 0.8 seconds approx. and by a "sex flush" which is a rapid change in skin colour of the chest (breasts and area between them up to the neck and face) resulting from an increase in cutaneous blood flow. The rate of perineal contractions may vary from woman to woman, and certainly not all contractions in an orgasmic series are evenly spaced, the first usually being relatively long. Internally, a lot more is going on, and videos of the inside of the vagina during orgasm show the cervix is very active and with each contraction it pushes down and "drinks" up semen from the puddle that would be there after a normal copulation so evolutionarily it only makes sense for the woman to come after the man has and only to do so if she wants to get pregnant by him! There are also waves of contractions of the uterus which are stimulated by the orgasmic surge in the hormone oxytosin. During orgasm the woman's blood pressure and heart rate increase considerably and she often does staccato breathing and may vocalise though this may be both voluntary and involuntary depending on the individual. Some hold their breath. Many also show spastic contractions of muscles in the hands and feet causing curling of toes (carpopedal spasms).

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