On nights when married women fall into sexual frustration, they seduce the delivery men who come knocking at their doors. The couriers' rugged looks, powerful builds, broad chests, and strong arms stir the wives' desires. To them, these men are the very symbol of masculinity—irresistible figures for sexually aggressive housewives. "Big brother, you have such a great body. Why don't you come inside?" they invite. Delivery drivers, gas technicians, electricians, newspaper collectors, insurance salesmen, and even janitors—all become targets in these women's hunting grounds. Faced with wives flaunting their proud big breasts and mature, shapely asses, the men stand no chance of escape. While their husbands are away, thirty married women give in to their desires, indulging in repeated affairs. Their passion and seduction deepen the story with every encounter.