[Solved] Interval scale measures are rating scales for subjective properties where,for adjacent levels,the distance is normally defined as one scale unit. Paternity Uncertainty: The impossibility for a male to be absolutely certain that he is the biological father of a child, due to the nature of internal fertilization and gestation in females. Extradyadic Sex: Sexual activity that occurs outside of a committed relationship, often considered a breach of exclusivity. Erotic Plasticity: The degree to which an individual's sex drive and sexual interests can change based on various social, environmental, and situational factors. Cheating: The act of being dishonest, deceitful, or breaking rules to gain an unfair advantage.