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A fluid which the penis usually emits with or around erection and before ejaculation, sometimes more than once. Pre-ejaculate itself does not contain sperm, but in some cases, can pick up traces of sperm left in the urethra.

A term used to describe deep manual sex, where many fingers or a hand are gradually inserted into the vagina or anus.

A chronic infectious liver disease with several different types. Hepatitis A, B and C are the most common and can all be transmitted sexually. All require medical care. Vaccines are available for hepatitis A and B.

How well something works under ideal or controlled conditions, like efficacy proven through scientific study.