Our expert says:
The average orgasm for a woman last about 20s. There is an initial spasm of the muscles surrounding the outer third of the vagina, followed by a series of rhythmic contractions, usually 5 to 8 in number. During orgasm there may be contraction of the abdominal muscles, neck and face muscles and sometimes contraction of the muscles in the feet. There is an increase in heart rate and blood pressure and hyperventilation. Some women experience a 'sex flush', a reddening of the skin on the trunk.
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