According to Osho, sex is not an individual necessity like food or air but a collective, biological urge enforced by nature through hormonal ‘hypnosis’ to preserve the race. A Buddha, having awakened from this compulsion, is no longer driven by the chemistry of reproduction; energy is conserved and transformed into awareness. Freed from identification with the body’s dictates, the psychological need for sex simply evaporates.
Sex is a species-level body push, and when someone fully wakes up, that push loses power and fades.