You first meet. Then you date. Then you marry. Within one year the sexual response goes away.

The four phases of the human sexual response pattern are excitement, plateau, orgasm, and resolution. These phases describe the stages that individuals typically go through during sexual activity.

Masters and Johnson were a research team influential in their study of human sexual behavior and response. Their groundbreaking work in the 1960s and 1970s led to a better understanding of the physiology and psychology of sexual response in humans.

Masters and Johnson's studies on sexual behavior revolutionized the understanding of human sexuality. Their research focused on the physiological responses of men and women during sexual activity, challenging traditional beliefs about sexuality. They developed the stages of sexual response cycle and emphasized the importance of communication and intimacy in sexual relationships.

An unconditioned response is a response that is natural and occurs without behavioral conditioning.

Examples would be:

Someone jumping when they are startled

A dog salivating when it is receiving food or a treat