DESCRIPTION:
This video should be seen as a scientific film, not a porn.
National Geographic takes a fascinating look at one of the world's most popular pastimes.
Through gripping real-life stories, new technology and cutting edge computer graphics we explore sex like never before, journeying from first times to playing the field - all the way to humankind's ultimate goal, procreation.
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some real FACTs:
Women on average think about sex 10 times a day, whilst men, almost double, thinking about sex almost 20 times a day. That's almost 7,000 times a year.

About 1.1 million American men and 800,000 women between the ages of 25 and 45 have never had sex.

Many people state that the optimum time for sex is between 3 and 13 minutes.

One study showed that 85% of men report that their sexual partner had an orgasm during their most recent sexual encounter, but only 64% of women report that they had an orgasm during their most recent sex.

One study showed that 70-80% of women usually achieve orgasm only by clitoral.

Sperm leaves the penis during ejaculation at about 28 miles per hour.

About 400 million sperm cells could fit on the head of a pin.

The clitoris has double the number of nerve endings as the end of the penis.

Despite numbering in their hundreds of millions, sperm only makes up about 3% of a man's semen.

It takes a sperm an hour to swim a few inches.

A teaspoon of semen contains about 5 calories.

It's thought that a longer ring finger results from higher testosterone exposure in the womb.

There are about 34 million people living with HIV worldwide.

Unused sperm is reabsorbed back into the body.