[Solved] Persistent sexually arousing fantasies and behaviors involving the suffering of self or others are an indication of A) erotic plasticity. B) a refractory period. C) premature ejaculation. D) a paraphilia. Regression: Psychological defense mechanism in which a person falls back on childlike patterns of responding in reaction to stressful situations. Depression: A psychological condition displayed by perpetual sadness or a withdrawal from activities, profoundly disturbing day-to-day life. Adolescents: Individuals in the transition phase from childhood to adulthood, typically ranging from ages 13 to 19. Females: Referring to the sex of a species that is typically associated with the production of ova or eggs.