What is an orgasm? An orgasm is an emotional and physical experience that occurs during a “sexual response cycle.” Before an orgasm, your body becomes increasingly excited. Breathing, heart rate and blood pressure increases. The pupils of the eyes dilate; the lips of the mouth darken, the nipples become erect, the clitoris swells, becomes hard and exposed, (much like the aroused penis). With increased excitement, the skin becomes flushed and it begins to sweat. In women the labia, clitoris, vagina and pelvic organs enlarge in very much the same way as the aroused penis enlarges. Sometimes there is a plateau of excitement which is held for several minutes before you are about to orgasm.

Orgasm is the point at which all the tension is suddenly released in a series of involuntary and pleasurable muscular contractions that may be felt in the vagina and/or uterus (some women do experience orgasms without contractions).

The orgasm happens when excitement seems to go over the edge ~ a climax or crescendo is reached which may last several seconds or longer. During orgasm the body stiffens and the muscles contract.
Involuntary muscle contractions and spasms may occur in various parts of the body, including your legs, stomach, arms, and back. The muscles of the vagina relax and contract rapidly, as do the muscles of the uterus. The glands of the vagina (Bartholin’s glands) discharge a watery secretion, which acts to lubricate the vagina.

The main physical changes that occur during a sexual experience are a result of vasocongestion. This is the accumulation of blood in various parts of the body. Muscular tension increases and other changes occur throughout your body also.

According to this article from Forbes there are many benefits of orgasm and sex. You have an improved sense of smell, reduced risk of heart disease, weight loss (sex is exercise after all), reduced depression, pain relief, a better immune system, better teeth, a happy prostate, and better bladder control.
In a study in 2001 a study found that having sex three or more times a week, men reduced their risk of heart attack or stroke by half. You can burn up to 200 calories which is about as much as running on the treadmill for about 15 minutes.

You can read more about it here.

It’s no secret that many women have multiple orgasms. Masters and Johnson documented this occurrence more than 25 years ago. But, do they serve a purpose besides from a pleasurable one? Theories suggest that muscular contractions associated with orgasms pull sperm from the vagina to the cervix, where the sperm can then swim their way to the fallopian tubes to reach the egg. Researchers believe that if a woman climaxes up until 45 minutes after her lover ejaculates, she will retain significantly more sperm than she does after non-orgasmic sex.

We will talk more about multiple orgasms later.

The difference between a clitoral and vaginal orgasm is where you are being stimulated to achieve orgasm, not where you feel the orgasm. The clitoris has a central role in elevating feelings of sexual tension. During sexual excitement, the clitoris swells and changes position. The blood vessels through the whole pelvic area also swell, causing engorgement and creating a feeling of fullness and sexual sensitivity. Your inner vaginal lips swell and change shape. Your vagina balloons upward and your uterus shifts position in your pelvis.

For some women, the outer third of their vagina and the cervix are also very sensitive or even more sensitive than the clitoris. When stimulated during intercourse or other vaginal penetration, these women do have intense orgasms. This would be what is referred to as a vaginal orgasm without clitoral stimulation.

In reality, orgasms are a very individual experience and there is no one correct pattern of sexual response. Whatever feels good to you, makes you feel alive and happy, and connected with your partner is what matters.

The term G-spot was coined by Addiego in 1981. It is named after the German gynecologist Ernst Grafenberg who is claimed to have first hypothesized the existence of such an area in 1950.

The Gräfenberg spot, or G-spot, sits directly behind the pubic bone within the front wall of the vagina. It is usually located about half way between the back of the pubic bone and the front of the cervix, along the course of the urethra and near the neck of the bladder, where it connects with the urethra. The size and exact location vary. Imagine a small clock inside the vagina with 12 o’clock pointed towards the navel. The majority of women will have the G-spot located between 11 and 1 o’clock a few inches inside the vagina. It is an erogenous zone that when stimulated leads to high levels of sexual arousal and powerful orgasms.

Finding the G-spot

The G-spot responds to pressure rather than to touch. Gently stroking is not likely to get any results. It’s more like massaging a marble under a mattress - one has to compress the flesh to find it.

Lie back with your knees pressed up to your chest. In this position, your vaginal depth will shorten and even small fingers should be able to reach the G-spot. With a partner, lie on your side with one leg drawn up to your chest as your partner enters you from the rear. He should be able to hit the spot.

Insert your fingers and bend them gently up, around and behind the pubic bone. Beyond the rather rough-surfaced tissue immediately behind her pubic bone, your fingertips will encounter a very soft, smooth area.

When you straighten your fingers and reach further inside, you’ll encounter a hard, rubbery structure that feels like an erect nipple pointing south. This is her cervix. The G-spot is the flesh immediately in front of the vagina.

When you reach in from the front with the woman on her back, the heel of your hand is over her clitoris while your fingers hook around her pubic bone. Pull upwards, as if you’re trying to lift her off the bed. In face-to-face intercourse, the penis may not stimulate the spot enough to do any good, although some positions, such as the one where the women draws her knees close to her chest, may increase the changes for a G-spot orgasm. You may try using a Liberator to adjust her position or a G-spot vibrator to hit the right spot.