Learn more from WebMD about the sexual response cycle, from arousal to post-orgasm. Next Article. Video: Human Pheromones: Our Love Scents What Are the Phases of the · Phase 1: Excitement · Phase 2: Plateau. response. In order to understand sexual problems, we need to expand concepts of the human sex-response cycle (Bancroft, ; Basson, a; Pfaus, ;.