At some point in the future governments around the world wanted to give people more choices in who they are so they decided to lock gender from children. so from some point onward children are born with no gender, and they're genitals are similar to girls just without any hint at reproductive organs. It used to be that after their bodies entered puberty they would be able to choose their gender, but after seeing family pressures and not trusting kids to choose their gender another system was devised. Using nanotechnology little robots take statistics and using unknown algorithms a gender is determined at puberty. No one really knows the statistics but people theorize it may have to do with the ratio of nearby men vs. women, the activities performed, preference to one gender or another, etc. however no one is exactly sure what the algorithm takes into consideration. Regardless of the gender society has advanced, lots of advanced technology has been developed, and advanced allowing for more accessories and augmentation... although thanks to the new gender system gender augmentation is considered to be a horrendous taboo. Now who are we following.