Isn’t boy vs. girl just a simple matter of different sex chromosomes (XX vs. XY) and body parts?

Reproductive Health

A: Actually, humans come in a variety of X and Y chromosome combinations (not just XX and XY) and body parts (i.e., anatomy). TL; DR: Most people that have XX chromosomes develop what is considered “typical” female anatomy and most that have XY chromosomes develop “typical” male anatomy. But not always. Other sex chromosome combinations