Reproductive organ during sexual intercourse

Sexual intercourse , also called coitus , or copulation , reproductive act in which the male reproductive organ in humans 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 the female egg and forming a new organism. In some vertebrates, such as fish , eggs 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 serves both excretory and reproductive functions. During intercourse, the blood flow is temporarily increased and trapped in the penis so that it becomes enlarged and elevated, a condition known as erection.

The external structures of the male reproductive system are the penis, the scrotum and the testicles. Penis — The penis is the male organ for sexual intercourse. It has three parts: the root, which attaches to the wall of the abdomen; the body, or shaft; and the glans, which is the cone-shaped end of the penis. The glans, which also is called the head of the penis, is covered with a loose layer of skin called foreskin. This skin is sometimes removed in a procedure called circumcision. The opening of the urethra, the tube that transports semen and urine, is at the tip of the glans penis.

Pain during intercourse is very common—nearly 3 out of 4 women have pain during intercourse at some time during their lives. For some women, the pain is only a temporary problem; for others, it is a long-term problem. The internal female reproductive organs and the external female genitals. Pain during sex may be a sign of a gynecologic problem, such as ovarian cysts or endometriosis. Pain during sex also may be caused by problems with sexual response, such as a lack of desire the feeling of wanting to have sex or a lack of arousal the physical and emotional changes that occur in the body as a result of sexual stimulation.

NCBI Bookshelf. The female sex organs make it possible for women to become pregnant and give birth to children. But they have other important jobs, too: They produce hormones, control the process of girls maturing into grown women, and make sex and sexual pleasure possible. Like men, women have external and internal sex organs.