[Solved] The experiment that involved a group of laboratory rats being allowed to breed without limit in a confined space in order to study the effects of crowding was conducted by __________. Sexual Gatekeeper: A concept describing a person who exercises control or holds the decisive power over the initiation of sexual activities in a relationship or social setting. Cultural Norms: Shared expectations and rules that guide behavior of people within social groups. Exotic Becomes Erotic: A theory proposing that attractions are formed for what is different or unfamiliar, especially in the context of sexual orientation development. Schachter's Theory: A theory suggesting emotions are experienced through a combination of physiological arousal and the labeling of that arousal based on cues from the environment.