[Solved] What are some factors that account for variations in body weight? Sexual Response Cycle: A four-stage pattern of physiological and psychological responses during sex; the four stages are experienced differently by males than by females. Alfred Kinsey: Alfred Kinsey was a pioneering American biologist and sexologist who conducted groundbreaking research on human sexuality in the mid-20th century. Erotic Photographs: Images intended to stimulate sexual arousal, typically featuring nude or semi-nude subjects in suggestive poses. Bisexual: A sexual orientation characterized by the attraction to both males and females.