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Located in the scrotum, the testicles (also called the testes) are a pair of glands that produce sperm cells and testosterone, the primary sex hormone and anabolic steroid in males. Testosterone plays a key role in the development of male characteristics. It is involved with sex drive, erections, and sperm production. It also helps build muscle and bone mass.
Affecting about 200 million women worldwide, endometriosis occurs when endometriotic tissue (which typically lines the inside of the uterus) grows outside the uterus. This tissue might be found on the ovaries, fallopian tubes, bladder, rectum, or intestines. It can also appear on the peritoneum, (the membrane that lines the abdominal cavity), and can even affect the thoracic cavity (namely the lungs and diaphragm).