[Solved] A circadian rhythm involves a biological cycle that fluctuates approximately every 24 hours. Daryl Bem: A psychologist known for his work on the theory of psychological androgyny, the self-perception theory, and the exotic becomes erotic theory regarding sexual orientation development. Erotic Plasticity: The degree to which an individual's sex drive and sexual preferences can be shaped by cultural, social, and situational factors. Heterosexual: A sexual orientation characterized by a romantic or sexual attraction towards individuals of the opposite sex. Homosexual: A term describing individuals who are emotionally, romantically, or sexually attracted to members of the same sex or gender.