Although more frequent sex is generally linked to greater relationship satisfaction, once per week seems sufficient; more sex than that appears to have no additional benefit. But Loewenstein’s broader insight is profound: Because our spontaneous desire for sex declines as the novelty of the relationship fades, and because life is busy and tiring, many of us fail to initiate sex even when doing so would have been physically pleasurable and emotionally connective—even when we would have been glad we’d done
