Men who have sex with men were, and still are, disproportionately impacted by HIV because it transmits much more easily through anal sex than through vaginal sex.
By then, the sexual revolution was in full swing and HIV was spreading silently among gay male populations in large American cities. It was not until the late 1970s when the HIV strain that started the North American pandemic had made its way to the United States, via Zaire and Haiti.
