in the world of equestria, it seems male and female mental abilities and optimizations more closely mirror each other. mlp ponies seem to have very little sexual dimorphism, with females more closely mirroring male cognitive abilities and males more closely mirroring female social avilities(not to strange as they are herbivores). the males seem to have higher bodily strenght. the females seem to be less impared by pregnancy than human females (possibly due to the quadruped stance).
if we take the family size of the mane 6 into consideration (as an average), the fertility rate is 2.67, and therefore above reolacement value.
if the human forms mirror the pony forms ages, the mane 6 should be 16-18 years old. pony society seems to have a rather short school period (possibly due to the lower technological developement (seeing the application of magic as technologie)).
there seems to be an overabundance of female ponies (can be offset by the .5 births per female even with monogamy).
the rules of equestria are godlike beings, and therefote not translateable to the real world.
the overabundance of females would allow for (or force) these females to stay childless and necessarily persuit a career.
(in other words: if bigmac were to be less shy he would get mad horsepussy)
the mane 6 seem to be outliers in their ability in the first place (normal for shows besides sitcoms).
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