Courtesy tug

To masturbate before sex, so as to maintain sexual stamina during sex.

Peter: I don't think Mary will give it up anymore. Every time we have sex I always blow my load right away.

Paul: You really need to start giving yourself a courtesy tug.

Peter: What's that all about?

Paul: It's when you rub one out right before having sex, so as to maintain stamina during sex. You'd really be doing Mary and yourself a favor.

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