A person's sex is determined by their DNA.But think about this if you would please. Are you a man because your brain tells you you're a man, or because you have a dick? Are you a women because your brain tells you you're are a woman, or because you have a vagina? This is a serious, not a frivolous, question.
Frankly, the evidence is building that our sexuality is determined by something other than body parts alone.
Is it better to use 19th century knowledge or 21st century knowledge when making these decisions?