Pregnancy can be appropriate according to their own situation coitus, coitus can take the following correct position: 1, back side position: the male and female lying on their sides in the same direction, will not cause excessive pressure on the abdomen of pregnant women, and can increase or decrease the depth according to the wishes of the male, more suitable for the middle of pregnancy. And this position will not damage the vagina or the opening of the uterus, and will not cause allergies; 2. Front-side position: the position where the male and female face each other and lie flat on their sides, which will neither press on the abdomen nor be too deep; 3. Front-sitting position: the position where the female and male sit for union, so there will be no pressure on the abdomen and the depth of union can be adjusted, which is a safer position; 4. Back-back position: the male supports from the rear The back position of the upper body of the woman, will not exert weight on the woman’s body, but also can be adjusted at will to the depth. In addition to the above posture positions, couples can moderately look for suitable positions, but must pay attention to protect the abdomen to avoid excessive pressure and weight on it. And the first three months of pregnancy, due to early pregnancy reaction, some pregnant women’s sexual desire and sexual response is inhibited, coupled with the placenta is not fully developed, prone to miscarriage. Therefore, sex during this period should be less than usual, and the range of action should not be too large.