Sex looks simple until you meet the people this film follows, several individuals born with differences of sex development that scramble the neat line between male and female. Geneticists and endocrinologists explain how chromosomes, hormones, and genital anatomy can diverge from one another before birth, producing bodies that do not fit either box cleanly. Interview subjects describe growing up with ambiguous genitalia, discovering as teenagers that their chromosomes did not match the sex they were raised as, and living with conditions like androgen insensitivity syndrome. Doctors walk through the biology of the SRY gene and the cascade of hormonal signals that usually, but not always, sorts a fetus into male or female. Rather than arguing a position, the film uses these cases as evidence that biological sex is a spectrum of outcomes rather than a strict binary, and lets the people living with that reality describe what it costs them socially and medically. The tone stays clinical and personal at once, not campaigning, just documenting bodies that don't fit the paperwork.