The colloquialization of 'sugar daddy' accelerated with the sexual liberation of the 1970s, while the emergence of leather fashion, LGBT movement and BDSM subculture gave rise to the term 'leather daddy,' which describe the leather-clad older male who assumes the dominant role in a sadomasochistic relationship. The earliest known use of 'daddy' in nonfamilial and sexual context can be attributed to the term 'sugar daddy,' a man who spends money for the benefit of a relationship with an often younger sexual partner, which has been documented in publications since as early as the 1920s, according to Google Ngram Viewer.
