Female robots have recently become incredibly popular. Why are male compatriots particularly interested? The Japanese 'AI Wife Robot' Erica sold out in just 3 seconds on its official website. This gadget can customize its appearance, and you can choose between a gentle sister or a lively girl. Surveys show that for every 100 men, 70 find it interesting, and 25 are willing to spend half a month's salary to take it home. These robots can not only chat but also remember your favorite dishes and serve hot soy milk promptly at 7 AM. Tokyo programmer Kobayashi said that after working late into the night, the robot can even recognize the angle of his frown and plays the same tunes he hummed last week.