The penis stimulates the uterus during the second trimester of pregnancy, which can easily cause uterine contractions, and in serious cases, can easily induce the occurrence of premature birth. After the second trimester, the height and weight of the fetus grows faster, the uterus gradually increases in size, the uterine wall becomes thinner, and the stimulation is likely to induce contractions. The actual fact is that you can find a lot of people who are not able to get a good deal on this kind of things. The first thing you need to do is to have sex during pregnancy, except for the second trimester when you can have intercourse, but not during the first and second trimester. If you have sex in early pregnancy, it will easily lead to miscarriage, and if you have sex in late pregnancy, it will easily induce premature birth. In addition to not having intercourse during the second trimester, it is also not recommended to take a tub bath. It is recommended to take a shower and to be accompanied by a family member to avoid any accidental injury.