The developmental line of gender and sexuality is marked by four nodal points along its sometimes treacherous traverse from birth to adolescence—biological gender; core gender identity (the inner, subjective perception of being male or female, the contours of which are definitively shaped by three years of age); sex role (the culture’s stereotypical patterns and characteristics of boy/girl, man/woman behavior); and, finally, sexual orientation (preference for a male or female sexual partner). (10 pp.)