"Intersex people are not rare, but they are widely misunderstood. Biology classes often oversimplify a fundamental reality. We are taught that sex is dimorphic: simply male or female. But sex, in reality, is a spectrum—with the majority of humans appearing to exist at one end or the other. In fact, as many as 1.7 percent of babies are different from what is typically called a boy or a girl. The chromosomes, gonads, internal or external genitalia in these children—intersex children—differ from social expectations. Around 1 in 2,000 babies is different enough that doctors may recommend surgical intervention to make the body appear more in line with those expectations."