There's technically no gender differentiation in English either.
That is incorrect. You are ***** gramatical gender with sex. English has three genders (masculine, feminine and neutral - him, her, it and similar triads of words). There have, in recent years, been attempts to introduce more genders further conflating gramatical gender with sex, sexuality and sexual orientation.
When I was young official forms would ask for a person's sex, but then people got coy or squeamish (or fed up with silly answers such as "yes please") and replaced it with the then technically incorrect request for their gender which is technically different from, though in English it correlates with, their sex (but not in German nor in old English).