Night is the time when people are deep in sleep, but for the brothers-in-law in the movie, it's a different story. It's the perfect time for them to sneak around, engage in sexual activities with their attractive sisters-in-law whom they find very appealing during the day. The sisters-in-law are not innocent either, as they do not resist or scream when they see the huge penis of their brothers-in-law. Instead, they cooperate and even appear to enjoy being intimate with them.