Sex: biological distinction between females and males (biological point of view: the way humans reproduce) Primary sex characteristics: genitals, organs used for reproduction. Secondary sex characteristics: bodily development, apart from the genitals that distinguishes biologically mature females and males. (females: wider hips, milk producing breasts, soft, fatty tissues for nutrition supply) (males: more body hair, muscle in upper body, deeper voices) Gender: an element of culture that refers to the personal traits and patterns of behavior including responsibilities, opportunities and privileges that a culture attaches to being female or male. Intersexual people: people whose bodies, including genitals, have both female and male characteristics (hermaphrodites) Transsexuals: people who feel they are one sex though biologically they are the other. Transgendered: disregard conventional ideas about how females or males should look and behave. Gender reassignment: surgical alterations of genitals accompanied by hormone treatments. Gender identity: traits that females and males, guided by their culture, incorporate into their personalities.