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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.