punchcard
A promiscuous person who has many sexual partners. Refers to a pass (most commonly used on commuter trains, subways and amusement parks) with ovals printed on it that indicate the number of times it can be used before a new ticket needs to be bought. Every time it is used, the ticket taker uses a paper punch to cut a hole in the ticket. Indicates that the person is like the paper ticket: cheap, good for a ride, used in all holes, considered disposable by the user, and discarded after it's all used up and worthless.