It probably means that the color of the villain is going out to prostitute. If you want to quit the villain's color, you have to let him out and quit his feet. Modest gentlemen have a high demand for color. The ancients advocated see no evil, so the color warning for a gentleman began with his eyes, asking him not to look at what he shouldn't. The whole sentence means that the standards of abstinence between villains and gentlemen are different. The moral bottom line and self-requirement standard of the villain are low, so it is necessary to limit it in order to achieve the purpose of abstinence, while abstinence requires a high quality and accomplishment of the gentleman, which requires it to meet the standards of see no evil. Then the purpose of abstaining from gentleman's color should be achieved by limiting his vision.

Answer clearly, I hope I can help you.