It is recommended to put a pillow under the woman’s buttocks for the first time, so that the penis can be aligned with the vaginal opening, making it easier to enter and reducing the pain. Generally speaking, women’s vagina is a hidden structure, and if men’s sexual knowledge is not sufficient, they may not be able to find the right “entrance”. The woman’s lying position is also not conducive to the man’s force, and it is difficult to enter. Therefore, the woman’s buttocks under the pad, such as pillows, thick cushions, quilts, etc., can raise the woman’s pubic area, so that the man can observe the vaginal opening to find the right entry. However, this position will raise the possibility of pregnancy for women to a certain extent, so if there is no intention to get pregnant must do a good job of contraception throughout to avoid the great harm to women from unwanted pregnancy.