Doctors and scientists, being part of that two-sex culture, have done everything they can to try to force people who are in-between into one of the two clear types. Intersex people themselves have also generally wanted to fit into one of the two clear categories; most are not interested in being in a 'third' type.
Alice Domurat Dreger (/ˈdrɛɡər/) is a historian, bioethicist, author, and former professor of clinical medical humanities and bioethics at the Feinberg School of Medicine, Northwestern University in Chicago, Illinois.[3]