Sadhguru,Most Exclusive Video,What is sex? Why sex is made || Sadhguru English Speech,SEX
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Human sexual activity
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This article is about sexual practices and related social aspects. For broader aspects of sexual behaviour, see Human sexuality.
"Sexual activity" and "sexual behaviour" redirect here. For sexual behaviour of other animals, see Animal sexual behaviour.

Human sexual activity, human sexual practice or human sexual behaviour is the manner in which humans experience and express their sexuality. People engage in a variety of sexual acts, ranging from activities done alone (e.g., masturbation) to acts with another person (e.g., sexual intercourse, non-penetrative sex, oral sex, etc.)[1] in varying patterns of frequency, for a wide variety of reasons. Sexual activity usually results in sexual arousal and physiological changes in the aroused person, some of which are pronounced while others are more subtle. Sexual activity may also include conduct and activities which are intended to arouse the sexual interest of another or enhance the sex life of another, such as strategies to find or attract partners (courtship and display behaviour), or personal interactions between individuals (for instance, foreplay or BDSM). Sexual activity may follow sexual arousal.

Human sexual activity has sociological, cognitive, emotional, behavioural and biological aspects; these include personal bonding, sharing emotions and the physiology of the reproductive system, sex drive, sexual intercourse and sexual behaviour in all its forms.

In some cultures, sexual activity is considered acceptable only within marriage, while premarital and extramarital sex are taboo. Some sexual activities are illegal either universally or in some countries or subnational jurisdictions, while some are considered contrary to the norms of certain societies or cultures. Two examples that are criminal offences in most jurisdictions are sexual assault and sexual activity with a person below the local age of consent.

The birds and the bees and, of course, the fleas. Plants, fungi and amoebas too. It sometimes seems like sex is everywhere. But in biological terms, it is a minority pursuit. For the first 2 billion years of life on Earth, it didn’t exist. Even now, the organisms that dominate the planet – bacteria and archaea – don’t bother.

The origin of sex, then, is a bit of a mystery. And if its origins are hard to understand, its function is just as baffling. At first sight that seems ludicrous. Surely sex has an obvious function: it generates variation, the raw material for evolution. The reshuffling and recombining of genetic information helps species adapt. It can also help spread beneficial genes throughout a population and eliminate harmful ones. But there are big problems with this common sense argument.

The first is that sex is grossly inefficient. It makes much more sense to clone yourself. Cloning produces many more offspring than sex, which means that asexual species should rapidly drive sexual ones to extinction by dint of producing far more offspring competing for the same resources. What’s more, each clone has a combination of genes that has already been shown to be fit for purpose. Sex, by contrast, creates new, untested and possibly inferior combinations. In fact, sexual recombination disrupts favourable gene combinations more often than it generates them.

Sure, sex should be an advantage in the long term, over thousands and millions of years. Asexual species eventually accumulate mutations that they can’t get rid of, and which drive them to extinction. But evolution doesn’t work like that. It doesn’t plan ahead. All it cares about is the here and now.


And the trials and tribulations don’t end there. Sexual species have to find a mate, fight off rivals, and risk catching sexually transmitted diseases.

Finally, if sex is so beneficial, why is it that bacteria and archaea never evolved it, even though they do exchange bits of DNA from time to time? Conversely, if asexual reproduction is so great, why do almost all eukaryotes reproduce sexually at least some of the time? All this makes sex one of the biggest head-scratchers in biology.

For many years the best answer was the Red Queen hypothesis, a subtle variant on the “sex means variety” explanation. This imagines an arms race between parasites and their hosts. The parasites’ generation time is so short that they can out-evolve their hosts. By throwing up new mixtures of genes with each generation, sex enables at least a few individuals to survive. It is named after the Red Queen because, like Alice in Through the Looking Glass, we have to run fast just to stay in the same place.

 

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