Sexual response cycle: A vigorous contraction of muscles in the pelvic area expels or dissipates blood and fluid from the area of congestion. In women, the average number of contractions is 8 to 15 contractions at intervals of 1 every 0.8 seconds. In men, muscle contractions surrounding the seminal vessels and prostate project semen into the proximal urethra. Same time interval as in the woman, which force semen from the penis. As the shortest stage in the sexual response cycle, it is usually experienced as intense pleasure affecting the whole body, not just the pelvic area. It is also a highly personal experience: descriptions of it vary greatly from person to person.