Sex This is a complicated thing, especially for the fact that since there up to their ears, we have a limited view of its horizon. Can be described with a certain objectivity in the sexual behavior of fruit flies, but when we come to our behavior is another matter.
essential premise to talk seriously about sex is to clarify the cliché that men like to have sex as "an animal". Animals do not have sex: animals mate to reproduce. In the animal world the female when mating is fertile, ie during the inspiration (and the male, it goes without saying, adapts). The animals do not feel physical attraction to each other at different times that of fertility when the female ovulates receives the wave and emits hormonal signals of some kind (visual, olfactory ...) that irresistibly attract the males of his species, in ways quite different between animal and animal, for example the cat from the cats at all, while animals such as rhinos brawling is a matter of who wins the fight in the horn between the male elephants or the pack leader is a privilege. See that for male mating is irresistible, that neutralizes even the instinct of survival, but is limited to that precise moment. And in any case the sex himself the object of imagination or special processing. The aim is to contact the male seed of the female, sic et simpliciter.
to humans is another story: neither female nor male are aware of the moment in which the female is fertile, which is currently limited to just over 24 hours during the lunar month. Say, given the duration of sperm as well as that of the egg, much less than thirty days in a calendar year, ie about 365. Not only the male and female humans do not know when mating is fertile, but in most cases if they knew just what would refrain from the practice day ...
The explanation of our unique sexual behavior comes from our genes, that is, in other words, was determined by our evolutionary path. Now in Italy 's "evolution" do not study at school (you know, we are still creationists, and I'm surprised that it was accepted in principle that what the sun and planets) and out of doctors and perhaps biologists have no clear idea of \u200b\u200bwhat evolution actually is. Without dedicating another post about it, just to clarify that nothing is finalized in evolution. It is not, as many imagine, a path shaped like a pyramid where a superior will (mother nature?) prepare a draft party like amoeba and that is to be perfected in humans, as they thought the Nazis. Nor does the evolution takes the form opposite, and tree leaves, where a simple life form reaches a maximum differentiation. The evolutionary path is rather like a ribbon, a treadmill: the evolution is simply adapting life forms in what is called an ecological niche, ie to an existing space at a given time in a specific environment. Two different species do not share the same ecological niche. When this happens, the less suitable is destined to become extinct, like the arrival of marsupial mammals in Australia. There a design behind this adaptation, it's simply the species at a given time (even now, for example) are the descendants of species that have had the appropriate characteristics to enable them to generate enough children to not become extinct.
proliferate is not in itself a good thing or bad. Just to put it to Monsieur de La Palisse, we are the children of those who created it.
To illustrate, let's say that there were men who feared the dark and others who were indifferent, if not attracted. The first was neither better nor worse than the second, and did not enjoy any more than the others. There are no ethical discourse on the subject: just who was afraid of the dark, at night he was sheltered in caves, hopefully protected from the light of the fires, and so it was not eaten by lions, has had more chance to reproduce and today we are the descendants of those who were afraid of the dark yesterday. Or snakes. Or who was crazy for having a sexual relationship with a human being of the opposite sex.
Closed parenthesis evolution, it remains unclear why humans have sex while the other animals are confined to reproduce. The explanation lies in the complexity of the human mind and our evolutionary asset is the intelligence, but intelligence has to grow a very long time. We say that up to sixteen years, the man cub is quite helpless and need the care of a family in order to develop, unlike other animals where the dependence on parents last minutes, days or at most a year. A family of a father who impregnates his mother pregnant and then abandons her to her fate, she met an evolutionary success poorer than the one where a boy was going to hunt for himself and instead to take the spoils but poor, took him home to feed the female and the offspring. Humans today are the children according to family type described, and have inherited the genes and behavior. From the evolutionary point of view it was necessary for anything but the male invogliasse to this behavior, apparently disadvantageous in the short term - and you know that the short time they always their charm, take for example the pleasure smokers derive from smoking.
in software development are not created (behaviors) and hardware (bodies) from scratch, but you modify pre-existing equipment. For example, our jaw, that we have inherited from their grandparents' reptilian, is derived from fish gills. We do not need gills, but a jaw to chew it was convenient. Likewise, the evolution has invented (so to speak) Sex, borrowing from the connection sex. Sex
What is this? The irresistible desire to be released to mate to reproduce with all the ensuing drama, the size of the penis length of stay, apparently useless act. With the invention of sex, the human male did not go looking for more pussy available from time to time, but trying every day to her companion. Not provided it to him every 28 days (minus the periods of pregnancy and lactation, which in nature are three years), but a little more often. Since, as I explained above, there is a design or a purpose behind these projects, but it is simply the result of countless "cases", this comes from the connection of sex has led to a highly diverse behaviors of tastes and preferences in our sexual appetite. It is known that sexual preferences are extremely varied, and what one is not like what they like to another. I remember a friend who was an adolescent in search of pornographic films "with the pants" (in sexology this behavior is called fetishism). It was the only one among all of us and no one would exchange tapes with him. Not even in the kitchen there are as many tastes as in the case of sex: fetishism, exhibitionism, voyeurism, gerontophiles, sado-masochism, urolagnia, coprophilia ... (De gustibus). In sexology once an attraction other than that of pure penetration was defined as "movement of the sexual object." Even the breast, I say for the sake of argument, could be a shift from attention to the genitalia (the limit). Oral sex was not considered in previous civilizations, and the anal has always been considered against nature.
That's all for the scientific basis. For the near post the description of what humans do to come up with some way to mate. For questions, the professor replied in the comments.
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