The sexual response cycle is most commonly described as four stages: excitement, plateau, orgasm, and resolution. This model was developed by researchers William Masters and Virginia Johnson in the 1960s based on direct observation of thousands of sexual encounters, and it remains the foundation for how clinicians and educators talk about sexual response today. A fifth component, desire, was later added by other researchers, and alternative models have since emerged that describe sexual response as less of a straight line and more of a loop, especially for women.
Stage 1: Excitement (Arousal)
The excitement phase is the body’s initial response to sexual stimulation, whether that stimulus is physical touch, visual imagery, fantasy, or even emotional closeness. The hallmark of this stage is increased blood flow to the genitals. In men, this produces an erection. In women, it causes swelling of the clitoris and inner labia, vaginal lubrication, and expansion of the upper vagina. Both sexes experience rising heart rate, increased blood pressure, and a general tightening of muscles throughout the body.
This phase can last anywhere from a few minutes to over an hour, and its intensity depends heavily on context: stress, distraction, comfort with a partner, and the type of stimulation all play a role. Nipples may become erect in both sexes, and a “sex flush,” a reddening of the skin across the chest and neck, sometimes appears.
Stage 2: Plateau
The plateau phase is essentially an intensification of everything that started during excitement. Blood flow to the genitals reaches its peak. In men, the testes draw upward and the penis may release pre-ejaculatory fluid. In women, the outer third of the vagina swells with blood (sometimes called the “orgasmic platform”), and the clitoris retracts under its hood, becoming highly sensitive to indirect stimulation.
Heart rate during intercourse can climb to around 130 beats per minute, and systolic blood pressure typically stays under 170. Breathing becomes faster and more shallow. Muscle tension increases throughout the body, particularly in the thighs, hips, hands, and feet. This phase can be brief or extended, and many people describe it as a building sense of tension or pressure that, with continued stimulation, tips into orgasm.
Stage 3: Orgasm
Orgasm is the shortest phase of the cycle but the most intense. It involves a series of involuntary, rhythmic muscle contractions centered in the pelvic region. These contractions occur roughly every 0.8 seconds. Women may experience anywhere from 1 to 20 or more contractions in a single orgasm. Men typically have 5 to 6 contractions, with a range of 1 to 10, and these coincide with ejaculation.
Beyond the pelvic muscles, orgasm can trigger contractions in the uterus, the anal sphincter, and even muscles in the hands and feet. Heart rate peaks, blood pressure spikes, and breathing may briefly stop altogether. Many people also experience a momentary altered state of consciousness, a narrowing of awareness where nothing exists except the physical sensation. The subjective experience of orgasm varies enormously from person to person and from one encounter to the next. Some orgasms feel like a full-body wave; others are more localized and subtle.
Stage 4: Resolution
During resolution, the body gradually returns to its unaroused state. Blood drains from the genitals, heart rate and breathing slow, muscle tension releases, and the sex flush fades. This process can take anywhere from a few minutes to half an hour.
A key event during resolution is a surge of prolactin, a hormone released after orgasm that creates feelings of satiety and satisfaction while simultaneously dampening arousal. Research published in the Journal of Sexual Medicine found that the size of this prolactin surge correlates strongly with how satisfying the sexual experience felt. Interestingly, orgasm during intercourse with a partner produces a substantially larger prolactin increase than orgasm during masturbation.
Prolactin is also central to the refractory period, the window of time after orgasm during which a person cannot become aroused again or reach another orgasm. For men, the refractory period is more pronounced and varies widely: it may last a few minutes in younger men, but 12 to 24 hours or longer in older men. Most women have a much shorter or nonexistent refractory period, which is why multiple orgasms in a single session are more common for women.
Where Desire Fits In
Masters and Johnson’s original model started with excitement, essentially assuming the person was already motivated to engage in sexual activity. But clinicians quickly noticed that this left out something critical. Without desire, there is little inclination to participate in sexual activity, and whatever physical arousal exists can easily be extinguished. In the 1970s, sex therapist Helen Singer Kaplan proposed a three-phase model that placed desire before arousal and orgasm, giving it equal weight as a distinct stage.
Desire is the psychological appetite for sex: the fantasies, urges, and mental readiness that precede or accompany physical arousal. It can be triggered by a thought, a memory, physical proximity to someone attractive, or hormonal shifts. For many people, desire is what initiates the entire cycle. But as later research revealed, this is not always the case.
The Circular Model for Women
The linear model (desire → excitement → plateau → orgasm → resolution) works reasonably well for describing many men’s sexual experiences. For many women, though, the process is less predictable. Sexual medicine researcher Rosemary Basson proposed an alternative circular model in the early 2000s that has become widely accepted in female sexual medicine.
Basson’s model starts from a place of sexual neutrality rather than spontaneous desire. A woman may begin a sexual encounter feeling emotionally open to intimacy without feeling actively “turned on.” Through physical stimulation and emotional connection, arousal builds, and desire emerges in response to that arousal rather than preceding it. In this framework, desire and arousal overlap and feed back into each other, with one stimulating the other in a loop. Many women report that they cannot clearly separate the experience of desire from the experience of arousal.
This model also gives more weight to emotional and relationship factors. Feeling safe, connected, and valued by a partner can be as important as physical stimulation in driving the cycle forward. And it acknowledges that orgasm contributes to satisfaction but is not the sole source of pleasure for many women. Emotional closeness, physical touch, and the sense of being desired can all produce deep satisfaction even without orgasm.
Why the Stages Matter
Understanding the sexual response cycle is not just academic. It gives you a framework for recognizing what is happening in your body and where things might be getting stuck. Sexual health professionals categorize most sexual difficulties by which phase they affect. Low desire, difficulty with arousal, inability to reach orgasm, and pain during sex each correspond to different points in the cycle and respond to different approaches.
The current diagnostic framework recognizes that the boundaries between stages are not always clean-cut, especially the line between desire and arousal in women. This is why the most recent clinical guidelines combine desire and arousal difficulties into a single category for women rather than treating them as separate problems.
Perhaps the most useful takeaway is that there is no single “correct” way to move through the cycle. Some people experience all four stages in a textbook sequence. Others skip stages, loop back, or find that the order changes depending on the day, the partner, or the context. The cycle is a map, not a rulebook.