To put it in comparison, 0.2% just happens to be the same percent of people who are born with more than 10 fingers or toes. So, pretty uncommon actually. And these conditions are almost entirely clearly male or female sex disorders (XO Syndrome can only happen in girls - so sex isn't something other than female, Kleinfelter is only a male intersex disorder, so sex is still very clear. Jacob's also only affects males). True hermaphrodites (with both) are incredibly rare and are a developmental disorder, or the result of a chimera (so, like super uncommon) not some other sex. A third sex, making it a continuum, would need to make a third gamete to be a seperate sex.