Human sexual response is depicted as a motivation/incentive-based cycle of overlapping phases of variable order. A sense of desire may or may not be present initially: it can be triggered alongside the sexual arousal resulting from attending to sexual stimuli. Sexual arousal comprises subjective (pleasure/excitement/wanting more of the same) and physical (genital and non-genital responses). Psychologic and biologic factors influence the brain's appraisal of the sexual stimuli. The sexual and non-sexual outcomes influence present and future sexual motivation. ANS, autonomic nervous system.