$ex in an MRI machine goes a bit deeper than normal, even for such an intimate act. Vox recently featured a video showing what speaking, swallowing, kissing, digesting, and yes even making love, look like under the penetrating eye of an MRI. Find out what John and Lissette think about this unique video! 
Does seeing the $*xual act under an MRI make you think about it any differently? Let us know in the comments!
Masters and Johnson coined the term

Masters and Johnson (two groundbreaking s*x therapists) coined the term "s*xual-response cycle" to mean the sequence of events that happens to the body when a person becomes s*xually aroused and participates in s*xually stimulating activities (intercourse, masturbation, foreplay, etc.). The s*xual-response cycle is divided into four phases: excitement, plateau, orgasm and resolution. There is no distinct beginning or end to each phase -- they're actually all part of a continuous process of s*xual response. Keep in mind that this is a very general outline of what happens to each of us as we become s*xually aroused. There is much variation among individuals, as well as between different s*xual events.

Simultaneous Orgasms

Both men and women go through all four phases, except the timing is different. Men typically reach orgasm first during intercourse, while women may take up to 15 minutes to get to the same place. This makes the likelihood of simultaneous orgasm during intercourse a rare event.

Phase One: Excitement

This phase usually begins within 10 to 30 seconds after erotic stimulation, and can last anywhere from a few minutes to many hours.
Men: The p*nis becomes slightly erect. A man's nipples may also become erect.
Women: v*ginal lubrication begins. The v*gina expands and lengthens. The outer lips, inner lips, clitoris and sometimes breasts begin to swell.
Both: Heart rate, blood pressure and breathing are all accelerated.
Phase Two: Plateau

The changes that started in the excitement phase continue to progress.
Men: The testes are drawn up into the scrotum. The p*nis becomes fully erect.
Women: The v*ginal lips become puffier. The tissues of the walls of the outer third of the v*gina swell with blood, and the opening to the v*gina narrows. The clitoris disappears into its hood. The inner labia (lips) change color (although it's a bit hard to notice). For women who've never had children, the lips turn from pink to bright red. In women who've had children, the color turns from bright red to deep purple.
Both: Breathing and pulse rates quicken. A "s*x flush" may appear on the stomach, chest, shoulders, neck or face. Muscles tense in the thighs, hips, hands and buttocks, and spasms may begin.
Phase Three: Orgasm

This is the climax of the cycle. It is also the shortest of the four phases, usually only lasting a few seconds.
Men: First, seminal fluid collects in the urethral bulb. This is when a man may have the sensation that orgasm is certain, or "ejaculatory inevitability." Next, semen is ejaculated from the p*nis. Contractions occur in the p*nis during the orgasmic phase.
Women: The first third of the v*ginal walls contract rhythmically every eight-tenths of a second. (The number and intensity of the contractions vary depending on the individual orgasm.) The muscles of the uterus also contract barely noticeably.
Both: Breathing, pulse rate and blood pressure continue to rise. Muscle tension and blood-vessel engorgement reach a peak. Sometimes orgasm comes with a grasping-type muscular reflex of the hands and feet.
Phase Four: Resolution

This phase is a return to the normal resting state. It can last from a few minutes to a half-hour or longer. This stage is generally longer for women than men.
Men: The p*nis returns to its normal flaccid state. There is usually a refractory period, where it's impossible to orgasm again until a certain amount of time has passed. The amount of time varies among men by age, physical fitness and other factors.
Women: The uterus and clitoris return to their normal positions. Some women may be able to respond to additional stimulation with additional orgasms.
Both: Swelling recedes, any s*x flush disappears, and there is a general relaxation of muscle tension.
Understanding what's happening to you and your partner's bodies during s*x can only aid in the full enjoyment of the experience. Combine this with some good communication skills, and you've found the key to unlock s*xual pleasure and your heart's desires.


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