When it comes to the body there is a very clear cut, obvious dichotomy. However, when it comes to the mind, the possibilities are endless. When it comes to personality, it is difficult to define male and female in two separate categories of personality just because there is a lot of person to person variation in all things, not just sexual orientation. However, chromosomes and genitalia are clear cut as one or the other though, although there may be exceptions to that in some cases (e.g. if someone is transgender).