Sex during Pregnancy
Some couples worry that by having sex they could harm the developing baby, but sex during pregnancy is generally safe. It's physically impossible for a man's penis to come into contact with the fetus, which is absolutely protected within the amniotic sac inside the uterus. So don't let that unfounded worry get in the way of sex.
During pregnancy, the couple should experiment with which sexual positions are the most comfortable for them. It becomes increasingly difficult to make love in the missionary style; the man's body puts too much pressure on the woman's abdomen. Starting around the fourth month (though it's is earlier for some) it's is more user-friendly for the couple to take the woman-on-top or rear-entry approaches to lovemaking. Women, if it's most comfortable for you to be on top, you'll probably be most satisfied lying on top of your lover, with your legs either between his or outside them. Kneeling astride him may also be a good position. If you're going for the rear-entry positions, your big belly won't get in the way. Lying on your side, or “spooning,” also allows your partner's penis easy entry.
Don't ever blow air into the vagina. It can have the serious, albeit rare, result causing an embolism and harming the woman and the baby.
Do try to accept the changes in the pregnant woman's body, without letting it negatively affect her body images or her partner's attu\itudes about how sexy she is.