The train lunch is a standing posture of equal status. The secret is to exercise waist strength and arm strength while making love, which can be described as killing two birds with one stone. This action means that the man is standing, the woman is holding the man's waist with her feet, the man is holding the woman, the woman's hands are crossed around the man's neck, and the woman's upper body is suspended. It looks like a peddler selling box lunch on the train, hence its name. Making love in this position requires a high level of strength in men's waist and abdomen. There are higher requirements for women's arm strength. When using this posture, if the strength of the male waist and abdomen can't bear the weight of the female, there is a risk of penis fracture.