equalizing biology, viablity of male pregnancy

Inspired by this thread
http://boards.straightdope.com/sdmb/showthread.php?t=434309&page=5

Seahorses do it. We’re not seahorses but other then lacking the research is there any fundmentle reason couldn’t be adapted to carry a baby to full term (other then the obvios need for c-section, or YOW!) It’s my understanding that male sex structures are basically based off the same ones as female’s. Just shifted from egg holding to sperm delivery.

Even if they can’t (which I’m guessing is probably) Could prosthetics could be devised? what would the obsticals then? Would male hormone levels screw up development? Would the immune system attack the kid? Would the dude’s body be unable to keep up with the energy requirments? Any other problems?

Although only women have wombs, the placenta and other things the baby needs are mostly produced by the growing embryo - a fetus is basically a parasite. And women have been known to have pregnancies outside the uterus (ectopic pregnancies). One scientist claims to have impregnated a male simian as part of an unrelated study (not to research male pregnancy, but to see if drugs that affected female hormone levels, etc would matter to a pregnancy). But this same scientist was years later involved in a scandal so some doubt was cast on this. But yes, basically it should be possible to implant the embryo in a blood rich area such as the omentum (a bloody sac that hangs over the intestinal area) and haveit grow to term in a male. The biggest danger is the same with female ectopic pregnancies - both during growth and especially during delivery - of accidental bleeding to death. The female womb creates a fairly unique environment for the purpose of managing the safe connection to, sustaining of, and eventual disconnection from the blood supply.

Hmm that’s really interesting.

But aren’t ectopic pregnancies inherently dangerous?

Wikipedia does mention nontubal ectopic pregnancies which can be salvaged, this happens very infrequently:

Your link proves jackdavinci point:

As far as male hormones:
Production of testosterone by fetal tissues is what induces the formation of male genitalia, at least in animals. Implanting fetuses into men would likely result in a lot of people who are chromosomally female (XX) but who look like males on the outside.

This happens with twin cattle where one fetus is a male and one is a female. As the fetuses’ placentas grow, they become entwined and their blood streams mix. (this appears to be unique to cattle placentas, as other polyparious ruminants with similar placental designs, like sheep, manage to keep their fetal blood streams to themselves.)

Testosterone produced by the male cattle fetus gets into the female’s tissues and masculinizes her to various extents. She becomes neither male nor female, and is termed a freemartin.