[Solved] The presence of diminishing marginal returns to labor leads to decreasing marginal revenue product of labor and a downward-sloping demand for labor curve. Reiss's Wheel: A theory by Ira Reiss that outlines a circular process of four stages in developing and sustaining intimate relationships, including rapport, self-revelation, mutual dependency, and personality need fulfillment. Sexual Activities: Behaviors involving sexual organs that are intended to produce erotic pleasure and/or reproductive outcomes. Bolstering: The act of supporting or strengthening something or someone. Submissive: Inclined or ready to submit or yield to the authority of another; unresistingly or humbly obedient.