[Solved] Production involving a positive externality is inefficient. Pornography: Depiction of sexual content aimed at creating sexual arousal in the viewer. Premarital Sex: Sexual activity practiced by individuals before entering into marriage. Sexual-Response Pattern: A sequence of physical and emotional changes that occur as a person becomes sexually aroused and participates in sexually stimulating activities. Plateau: A stage where no visible progress is made, often encountered in physical training, learning, and other areas of personal development.