Originally posted by Astner
Which has nothing to do with growing up with a father- and a mother figure.
Sure it does. Your post implied that mother-father nuclear families are essential and it's so axiomatic even the ancient Greeks knew it. And while they did recognize a family structure, they also practiced sexual abuse which has damaging effects on child development. Sexually abused children struggle in schools if they are not able to cope with what's happening to them, especially when it's ignored or advocated by parents or social institutions.
As for the Spartans, due to their classification as both "ancient Greek" and "warrior culture", their men grew up separate from the women and only intermingled to procreate; otherwise, the men stayed together and formed strong emotional bonds and it is stated that they often became attracted to each other, to the point that many Spartan wives had to dress like men and have sex from behind to conceive.
So because your point implied the ancient Greeks had a handle on the evident truth, I felt the need to make sure you understood just what else the ancient Greeks did. They also practiced slavery and women had almost no rights compared to Canada, where the study took place, or obvious modern first world country parallels.