In 1905 Sigmund Freud wrote his famous book "Three Essays on Theory of Sexuality" in which he said that at first, being a teenager, a girl experiences clitoral orgasm that is achieved through masturbation and after some time a mature woman begins experiencing vaginal orgasm that is achieved during sexual intercourse. He supposed that the clitoris is a kind of intermediary that transmits arousal to surrounding genital areas. He compared the clitoris to a sliver that is used to burn more solid fuel.
He was convinced that the vagina, rather than clitoris should be the zone that is responsible for orgasm.
The awfullest thing about this theory is that Freud called women who never achieved orgasm without direct stimulation of clitoris immature and (or) frigid! The famous psychiatrist, the author of the theory of human psychosexuality was absolutely wrong, and that has been proven by scientists who have found out that the overwhelming majority of women need direct stimulation of clitoris to achieve orgasm.
According to scientific data about 70 percent women need clitoral stimulation to achieve orgasm. Some scientists say that this figure is even bigger, that is about 80 percent, i.e overwhelming majority.
However, the myth turned out to be very hardy. Millions of women still consider themselves to be immature or even frigid, since they cannot achieve orgasm during sexual intercourse. Why does it happen? It happens because an ignorant partner does not know that the only thing his partner needs to achieve clitoral stimulation (during foreplay or intercourse) with fingers or tongue, and the problem will be solved. However, often this does not happen.
The question is: who is "sexually normal" - the remaining 30 or even 20 percent of women or the majority for whom intercourse without clitoral stimulation is not enough to achieve orgasm? May be not all men read Freud's works. May be they came across the myth about "frigidity" of women who do not achieve vaginal orgasm (i.e orgasm that is achieved during sexual intercourse) somewhere else.
May be it is so popular due to men's laziness: it is much easier to say that a woman is abnormal, rather than to do something to help her achieve orgasm. Also here some prejudices play a large part here. Some people still think that only intercourse is normal, while all other kinds of sexual stimulation are "perversion".
Here is the result: millions of women who can achieve orgasm only through manual (with hand or finger) or oral (lips, tongue) stimulation of clitoris (or with help of a sex toy, for instance a clitoral vibrator) consider themselves to be "abnormal", "immature" or even "frigid".
When writing his essay Freud confused male and female sexuality. The overwhelming majority of men achieve orgasm during sexual intercourse, and inability of a man to cum during intercourse is considered to be a abnormality – at least because this prevents a couple from conceiving, to say nothing of psychological problems. Why should women be like men?
Most organs are virtually the same in men and women, but men and women have different genitals! Why wasn't this taken into account?
There is the other side of the coin. In the beginning of the century most doctors were men. They imposed on women behavior and reactions that seemed attractive to them.
A woman who always cums during sexual intercourse without additional efforts is a man's dream. This is a dream and only a dream, it is not a law and not a rule. Orgasm - is a fantastic feeling, no matter how it is achieved!