"In the medieval Tantric traditions of India and Tibet documented by David Gray and Janet Gyatso, insertive but non-ejaculative sex is theorized as a fast path to liberating realizations, one deemed superior to celibacy for qualified practitioners (Gray 2007; Gyatso 1998). These developments also support the idea that the sex problematic in ancient, classical, and medieval Buddhism had at least as much to do with female fertility and the production of children as with the dangers of errant desire."