You're assuming that one sex effort, from three people, or two people and an it, creates one baby?
Unsustainable!
Obviously the script said that the couple on board G'Kar's ship was trying to make "a" baby, becuase these are the people that invented the Ocampa, where it takes two people to make one baby, and they can only get pregnant once, which means that each generation will be half the size of the last, until there are no more babies.
Vissians might deliver litters of babies more often than a single blessed darling, which will allow for population growth, without having constant access to congenitors.
Unsustainable!
Obviously the script said that the couple on board G'Kar's ship was trying to make "a" baby, becuase these are the people that invented the Ocampa, where it takes two people to make one baby, and they can only get pregnant once, which means that each generation will be half the size of the last, until there are no more babies.
Vissians might deliver litters of babies more often than a single blessed darling, which will allow for population growth, without having constant access to congenitors.