text: why can' guys be more like seahorses? male seahorses can get pregnant so why can't human men get pregnant. seahorses can't technically *get* pregnant, although they can carry the unborn baby seahorses in a pouch, so it is sort of like being pregnant, i guess.  but the main reason that human men can't do it is that we are mammals, not sea animals.  in mammals, whether it is dogs, cats, gorillas, sheep, tigers, or humans, one characteristic is that the babies grow in a placenta inside the female.