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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.

A fluid used in order to make kinds of sex (such as masturbation, vaginal intercourse, anal intercourse or manual sex) more pleasant and comfortable, and/or to help prevent condoms from breaking by decreasing friction.

On the penis, the head of the penis. On the vulva, the external portion of the clitoris, beneath the clitoral hood.

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