[Solved] It appears that there are almost no differences by gender in A)incidence of masturbation. B)attitudes about casual sex. C)arousal to erotica (viewing erotic scenes). D)anxiety and guilt about sex. Psychoneuroimmunology: The study of how psychological processes, the nervous system, and the immune system interact and affect health. T-cells: A type of lymphocyte that plays a central role in cell-mediated immunity, distinguishing between self and non-self molecules. Immune System: The body's defense mechanism against pathogens, comprising various cells, proteins, tissues, and organs. Immune System: The body's defense mechanism against infectious organisms and other invaders through a combination of physical barriers, cells, and proteins.