[Solved] A marginal change is a small incremental adjustment to an existing plan of action. Erotic Pictures: Images intended to provoke sexual arousal. Sexual Orientation: A person's emotional, romantic, or sexual attraction to individuals of a certain gender. Erotic Plasticity: The degree to which an individual's sex drive can be changed by societal or environmental factors. Homosexual Relatives: Family members who are attracted to individuals of the same sex.