Extras, in a strip club, are sexual acts that a dancer will do on top of dancing for extra money.
More About Extras
Some dancers will do extra services on top of dancing. Sometimes in the club in a private room, or after work outside of the club to make extra money. Hence the term extras.
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For example, a patron might ask a dancer, "Do you do extras?" or ask of a dancer, "Is she an extras girl?"
