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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.

Safe, Sane and Consensual - A framework that posits that all sexual play must 1) be based on safe activities, 2) involve all participants being of sufficiently sound mind, 3) have the full and informed consent of all participants at all times.

S. Nicole Lane is an editor and journalist whose work has been published in Playboy, SELF, Healthline, The Guardian, and other corners of the internet. She is the Senior Editor of Traverse Magazine.

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.