in sex

In Mexico, there is a third gender

In a small town in rural, indigenous Mexico, there exists a third gender known as muxe (sometimes spelled muxhe) among the Zapotec peoples. Considered neither male nor female, rather somewhere in-between like the hijras of India, muxes are (broadly speaking) biologically male but dress and act in ways typically associated with females.

Source: A Brief History Of Muxe, Mexico’s Third Gender