The orgasm is a pulsatile event with strong feelings of pleasure centred around the genitala and which can engulf the entire body with almost overwhelming sensations. In some cases, it can also be accompanied by a demanding pushing feeling.
In the majority of women, orgasm is usually indicated visibly by a series of contractions in the vaginal-anal area which occur at about once every 0.8 seconds on average. It is also often accompanied by "goose bumps", and by a "sex flush" which is a rapid change in skin colour of the upper body resulting from an increase in cutaneous blood flow.
The rate of perineal contractions vary from woman to woman, and certainly not all contractions in an orgasmic series are evenly spaced, the first usually being relatively short and pronounced. Perineal contractions can be visible higher up around the clitoris (causing the clitoris to "hop"), around the vaginal opening (causing the vagina to "snap"), on the sides of the vulva, or just around the anus. While some women may demonstrate only one of these types of contractions, others have all of them.
Internally, there are also waves of contractions of the uterus which are stimulated by the orgasmic surge in the hormone oxytosin.