In the final sequence of Billy Wilder’s 1959 comedy, Some Like It Hot, two couples are seated in a motor launch (see Photo 1.1). The pair in the stern appears to be lesbian, the one in the bow heterosexual. According to the terms used in this book, the former couple seems unlikely, transgressive of the social norm specifying that romantic couples must be composed of a man and a woman, a norm to which, by contrast, the latter couple appears to conform.