“…27 Four important conclusions can be drawn from surveys of sexual behaviour in several countries. [6][7][8][9][10][11][12][13][14][15] First, variation in sexual orientation is ubiquitous, with the great majority identifying as heterosexual and a significant minority reporting other identities. Second, patterns of reported sexual identity and behaviour vary with sociodemographic characteristics, such as sex, age and race or ethnicity.…”