4. In Ryan and Jetha's Sex at Dawn (2010, Ch. 5), they suggest that both 'jism' and 'jazz' come from the Ki-Kongo word dinza, meaning "to ejaculate", citing Robert Farris Thompson's Flash of the Spirit (1984) and Ventura's essay "Hear that Long Snake Moan" (1986). Culturally, rooting this word in an African language seems more likely to me than ...