Horler also expressed a disapproval of casual sex, especially homosexuality. Horler wrote to the British police demanding a crackdown on what he saw as "the alarming increase in sex perversion" in London, claiming the city's streets were full of male prostitutes. In his fiction, Horler spent a large amount of time emphasising how "virile" and "masculine" his heroes are. One of Horler's characters, the gentleman thief "Nighthawk", only steals jewels from women he sees as sexually immoral, pausing in his work to scrawl the word "Wanton" on their pillowcases.
