[Solved] The ultimate effect of large-scale arbitrage activities on exchange rates is the elimination of the variation between the two markets. 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.