A young couple got married, and on their first night in their new home, the husband said, "Sweetheart, we should set up some sort of a signaling system regarding sex. When we go to bed at night, if you want sex, just reach over and pull my penis twice."

The wife said, "Fine, but what do I do if I don't want sex?"

The husband said, "Then reach over and pull my penis fifty or sixty times."

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