[Solved] Previous infection with a bacterial STI confers immunity,so once a person has had chlamydia or gonorrhea,she or he cannot be reinfected. Reaction Formation: A defense mechanism where an individual behaves in a manner opposite to their actual feelings, often to hide their true emotions. Pornography: Material intended to cause sexual arousal that depicts sexual content in a manner designed to elicit or enhance sexual feelings. Erogenous Zones: Areas of the human body that are particularly sensitive to stimulation and can lead to sexual arousal. Psychosexual Stages: Psychosexual stages are a series of developmental phases in psychoanalytic theory, proposed by Freud, that children pass through, each characterized by different modes of seeking pleasure.