In the movie the woman leaves the man because he will not let her sit on his face anymore and she cannot fathom why that would be, sex was the last good thing they had, fused like a common diamond between them but stored in a lighthouse at the end of the driveway. Caretaking her genitals had been his one job, she told him toward but not during their end and it was his flush of symbolism in the physical positioning and his access to the breath that convinced her he was lying; there must be another woman.