[Solved] The full cost plus a markup transfer-pricing method can sometimes lead to goal incongruence. Heterosexual Couples: Romantic partnerships between individuals of opposite sex, typically involving sexual and emotional relationships. 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.