The third sex: male vs. female boy – girl (half of the world have penises, the other half have vaginas) Genitals are gender? Objects of sexual desires are form the "opposite sex" Why there is such a "natural" dichotomy god, science, doctors, mothers said so. The third sex is a convenient alternative to the "natural attitude" illustrate how gender, sex or sexuality can be constructed Intersex: approx. 5 % human births another category of phenotypic or biological sex in addition to the dichotomous categories of male and female