Simonsez - the dichotomy between biological sex and gender is a recent innovation. The word gender used to be limited to linguistics. Your biological sex and your gender are identical. With the exception of a tiny percentage of individuals who suffer from developmental accidents our sex/gender is binary.
Of course there are females who demonstrate personality traits and preferences traditionally associated with men and vice-versa. None of that requires the denial of the fact that humans are a sexually dimorphic species just like our non-human ancestors.