A line was drawn between a man and a woman when they opened a room. Then the man didn’t touch the woman all night. What’s the joke?

A boyfriend and girlfriend slept in the same room. The woman drew a line and said: "Those who have crossed the line are beasts." When she woke up, she found that the man had really not crossed the line, and the woman beat him hard. A slap in the face: "You are worse than a beast."

The next day when men and women slept in the same room, the woman drew a warning line as before. The man learned from the previous lesson and planned to cross the line late at night, but because of Nervous but unsuccessful. After dawn, the woman slapped the man and said, "I didn't expect you to be worse than a beast."