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In placental mammals, females have two genital orifices, the vagina and urethra, while males have only one, the urethra.

In typical prenatal development, sex organs originate from a common primordium during early gestation and differentiate into male or female sexes.

Gonads as primary sex organs, generate reproductive gametes containing inheritable DNA.

They also produce most of the primary hormones that affect sexual development, and regulate other sexual organs and sexually differentiated behaviors.

If the fetus has testes, and if the testes produce testosterone, and if the cells of the genitals respond to the testosterone, the outer urogenital folds swell and fuse in the midline to produce the scrotum; the protuberance grows larger and straighter to form the penis; the inner urogenital swellings grow, wrap around the penis, and fuse in the midline to form the penile urethra.

Each sex organ in one sex has a homologous counterpart in the other one.

The testis in the male, and the ovary in the female, are called the primary sex organs.

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