Sexual intercourseprocess called coitusor copulationreproductive act in which the male reproductive organ in freeblackwomensexvedios and other higher animals enters the female reproductive tract.
If the reproductive act is complete, sperm cells are passed from the male body into the female, in the process fertilizing sex female egg and sex a new organism.
In some vertebrates, such as fisheggs are laid outside of the body and fertilized externally. To accomplish internal copulation certain body and organic adaptations are necessary. In the human male, the penis process both excretory and reproductive functions.
During intercourse, the blood flow is temporarily increased and trapped in sex penis so that it becomes enlarged and elevated, a condition known as erection.
Erection changes the japan and small soft and flaccid organ to one of greater size and rigidity to permit easier penetration into the reproductive tract of the female.
In the female reproductive system, an external opening leads to the vaginawhich in turn communicates with the uterus or womba thick-walled, pear-shaped organ where the sperm fertilizes the egg and where the fetus develops.
In human beings, a pattern of physiological events occurs during process arousal and intercourse. These events may be identified as occurring in a sequence of four stages: The basic pattern is similar in both sexes, regardless of the specific sexual stimulus.
In the excitement stagethe body prepares for sexual activity by tensing muscles and increasing heart rate. In the male, blood flows into the penis, causing it to become erect; in the female, the vaginal walls become moist, the inner part of the vagina becomes wider, and the clitoris enlarges.