What Is It?

This app is a tool to find the gender or sex of a person who is perhaps tough to define using the standard gender binary forms. The app is intended to fulfill people's curiosity and queries, and not to be used as a tool to criticize others if they do not fit the expected gender norms.
Photos from: http://www.freedigitalphotos.net
From left to right:
“Businessman Head With Question Mark” by pakorn
“Person With Red Question Mark In Door” by sumetho
“Question Or Doubt” by Jeroen van Oostrom