the human female’s greatsword stance is realistic and on par with an actual sword stance.
This…
The stance the females use is akin to the actual Nebenhut stance. It’s just one of the proper ways of wielding a sword.
Here, take a look at this:
http://www.thearma.org/essays/StancesIntro.htm#.U-NJ62NTEmg
I prefer all genders to wield longswords like this.