VIDEOS:
Mana in the Womb
"Explore". After Pete Reston comes out to his friends as a sex-shifting "reversi", Chela McFarlane explains to him that his female form has an advantage he didn't know about: female mages can use their uteri as additional magical storage.
Example of:
Gender-Restricted Ability
Pete Reston, Reversi
Example of:
Sex Shifter