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When a body part, such as the penis or parts of the vulva, becomes filled with blood and enlarges and/or becomes more firm.

The internal passage between the anus and the colon; stores solid waste until it leaves the body through a bowel movement.

Characteristics that are seen or presented as distinguishing between male and female in a society. Gender may or may not include assigned or chosen: social roles, feelings, behaviors and/or presentation or appearance.

The tube that leads from the testes to the vas deferens. Sperm are stored in the epididymis before ejaculation.