There are four stage of sexual intercourse
These the phase are to describe sexual intercourse . But couple can not distinguish between each of them.
Once a certain level of excitement has been reached, the clitoris retracts under the clitoral hood or foreskin, and thus becomes inaccessible to direct stimulation by the woman or her sexual partner. (In the past, it was not always understood that this retraction of the clitoris indicates an increase, not decrease, of sexual excitement).
With mounting sexual excitement, the glans of the clitoris retracts under its hood.
Excitement phase :- It last for few minutes to hours depending upon the foreplay . When aroused the blood will pump into three corpora of penis . This make the penis still and rigid. The scrotal sac is raised slightly due to muscular contraction, testes upwards .
Female :- Walls of vagina start secreting the vaginal fluid .
The phase is short and intense .
It is shortest of all may last for few seconds.The series of involuntary rhythmic contractions in testis and the penis . Force out the semen from penis . This muscular contractions which occurs at interval of 0.8 second which gives sexual pleasure. The process of expulsion is known as ejaculation.
May be an orgasmic or multi orgasmic.Uterus orgasmic platform and rectal sphinter contract at interval at 0.8 second. That tapes in intensity an frequently.
Male divided in two phase 1st phase penis shrinks to half of its fully erect size. In second phase the penis return to the normal size. The second stage take little longer time than 1st stage .