[araneae]

Some people are intersex (typically this means they have ambiguous genitalia or internal sex organs). Therefore, there are people who are neither entirely male or female biologically. You can have an XY person who outwardly has female genitals, but has internal testicles (Androgen insensitivity syndrome)

There is also some question whether some things we don't consider intersex are actually a form of intersex, such as homosexuality. A lot points to homosexuality being innate, not learned, and I personally think this points to it being a form of intersex that affects the brain, not the genitals.

Some disorders can cause both. For example, females with Congenital adrenal hyperplasia (CAH) can have ambiguous genitals and also are more likely to be lesbian.