Sex with a pregnant woman can be a lot of fun. The ol' missionary position is out of the question after about three months, but that still leaves cowgirl & RC. Doggy-style is great as pregnant women gain weight, a lot of it goes to their ass. Then later as delivery nears, on her side is most comfortable. There's an old joke that goes around on the maternity ward. How long does a couple need to wait to have sex after the birth of a baby? Depends, on whether she has a private or semi-private room...