LOL I didn't know men could have babies-
You've heard of ectopic pregnancies, haven't you? That's where implantation occurs in the Fallopian tube rather than the uterus. Sometimes one of these 'tubal' pregnancies ruptures, and the unborn child implants in the peritoneal cavity, implanting its placenta on the intestine, which has a rich blood supply.
Of course, abdominal pregnancy, as its called, is quite rare, and even more rarely comes out with a successful result. Imagine medical science being able to manange the complications of abdominal pregnancy, and you could have test tube babies implanted into the abdomens of men. I can't imagine any ethical doctor doing this, but you know how it is with medical ethics.
Not an original idea, but something I read in an Omni magazine several years ago. Not enough money in the world to pay me to do it!