This is the 11th AIDS Review published by the Centre for the Study of AIDS at the University of Pretoria., South Africa This Review reflects on the borders that have been placed around sexual identity, sexual behaviour and sexuality. It also reflects on the need for sexual order in the dominant hetronormative discourse of most societies, where heterosexuality is deemed to be the norm and all other sexual identities and practices the exception to this rule, to be tolerated, albeit in a strained and tense way.