There seems to be five times more S-types than there are N-types, and there seems to be far more F-types in the world than T-types; I'd propose that two-thirds of women are F-types. Therefore, LII women should be relatively uncommon but considering the world population, they're not an endangered type. If my guesstimates hold water, duality would be an even rarer phenomenon.

a.k.a. I/O