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Penis Atlas Pdfl

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Infection typically presents with a classical itchy rash. Lesions are symmetrical, and mainly affect the hands, wrists, axillae, thighs, buttocks, waist, soles of the feet, areola and vulva in females and penis and scrotum in males. The neck and above are usually spared, except in cases of crusted scabies and in infections occurring in infants, the elderly, and the immunocompromised.

Library of Congress Cataloging in Publication DataHaeberle, Erwin J. The sex atlas.Bibliography: p. 531Includes index.1. Sex. 2. Sex (Psychology) 3. Sex role. 4. Sexual deviation. 5. Sexism. II. Title.HQ12.H33 1981 612'.6 81-12604 ISBN 0-8264-0178-3 AACR2 ISBN 0-8264-0057-4 (pbk.)

In sum, 1 hope that The Sex Atlas will now be used not only in college classrooms, but also in many homes and libraries as a primary resource, much like a geographical atlas or dictionary. 1 believe it could make both the understanding of sex and communication about it much easier and thereby contribute to a more humane environment for all of us.

However, our Western civilization, which is now several thousand years old, has not always worried about such problems. For the ancient Greeks and Romans, the nude human body was a familiar sight. Athletes practiced and performed in the nude at the gymnasium (Greek gymnov nude). The participants at the original Olympic games (and at all other sports events) were nude. Public and private buildings were decorated with sculptures and paint-ings of nude men and women. The sexual aspect of nudity was openly recognized. Statues of certain deities, such as Hermes and Priapus, displayed an erect penis as the symbol of strength and fertility. Artistic representations of sex organs were worn in the form of jewelry as a good luck charm. The actors of the comic stage wore monstrous penises as part of their costume. In short, there was an open and joyful acceptance of the human body and human sexuality. The contrast to our modern world could hardly be more striking.

In the first weeks after conception, the male as well as the female embryo is a tiny organism without recognizable human features. However, it does have a primitive head and limb buds which begin to grow into real arms and legs, The embryo further possesses a ridge of tissue which is destined to develop into sex organs. Indeed, the first beginnings of sex glands or gonads can already be found, but, at this point they are slill sexually undifferentiated, i.e., they are the same for both sexes. Externally, a hump (suggestive of the males with a groove (suggestive of the female) can be observed at the spot when.' the future sex organs will grow. As the male embryo slowly twgins to look more human toward the end of the third month of its life, the hitherto umlii ferentiated gonads develop into testicles. The external hump assumes the shape of a penis, and the groove closes, (As evidence of this original groove, each male retains a pink scar line running down the underside of his penis all the way from the glans to the anus.) Two patches of skin on either side of the hump begin to form the scrotum. (In the female, they become the major lips

In the period between birth and puberty, the sex organs do not show any dramatic further development. However, during the ages of 12 to 17 boys normally experience a noticeable growth of their sex organs and eventually their first ejaculation of semen. They will also notice that some hair (called pubic hair) begins to grow at the base of the penis. All of this indicates that the sex organs are completing their maturation. (For further details, see "The Male Sex Organs."}

In the male, the first body changes of puberty are the growth of the testicles, the appearance of pubic hair at the base of the penis, and an enlargement of the penis. These changes indicate that the body is reaching sexual maturity, and sometime thereafter the first ejaculation can occur. However, at first the ejaculate may not contain any sperm cells, but consist mainly of fluid from the prostate gland. (The first ejaculation may occur during masturbation or spontaneously while the boy is asleep. In the latter case, he is said to have a "wet dream.")

The human embryo is sexually undifferentiated during the first few weeks of its life, The primitive beginnings of its gonads are the same for both sexes. At the spot where the future external sex organs are destined to grow, there is a hump (suggestive of the male) and a groove (suggestive of the female). A clear differentiation begins only toward the end of the second month after conception. In the case of a male embryo, the production of the hormone testosterone (one of the androgens) is started, which slowly transforms the embryonic genital hump into a penis. The groove running down its underside closes, forming a single internal tube: the urethra. The gonads become identifiable as testicles, and, in the last weeks before birth, they descend into the scrotum. Without this prenatal production of testosterone in males, their proper anatomical development is impossible.

In the case of a female embryo, nothing special or additional is needed because the external and internal sex organs differentiate "automatically." (In a sense, therefore, the female sex might be called the "basic" or "primary" one.) In the absence of a specific stimulation by androgens, the originally undifferentiated gonads are transformed into ovaries. The embryonic genital hump grows into the clitoris. (Compared to the penis, the clitoris remains much smaller because of a lack of testosterone to stimulate its growth.) The genital groove, on the other hand, remains open and deepens, forming the minor lips and the vestibule of the vulva.

The male external sex organs consist of the penis and the scrotum. The testicles and their attachments, which are contained in the scrotum, are usually considered internal organs, although they are outside the abdominal cavity.

sum). This latter body contains the urethra (the duct through which urine and semen are released). Heavy arteries can quickly fill these spongy bodies with blood, thus causing them to stiffen. As a result, the penis becomes erect. Conversely, when the blood leaves the spongy tissue the erection subsides. Erections of the penis are usually triggered by sexual excitement, but they can also occur for other reasons. (For details, see "The Male Sexual Response."}

During an erection the penis increases in size. This is possible because the skin-covering it is very loose. In fact/ toward the end of the penis some of this skin forms a freely hanging fold known as the foreskin or prepuce. This foreskin normally covers the tip or head of the penis called the glans. In the case of an erection, however, the glans protrudes from the foreskin and becomes fully exposed. The glans is usually slightly thicker than the body of the penis, and its shape has been compared to that of an acorn. (Glans is Latin for acorn.) Actually it is the extension of the corpus spongiosum, and it contains the external opening of the urethra. Since its smooth surface is studded with innumerable nerve endings, the glans is extremely sensitive to the touch, particularly around its rim. By the same token it.is also an important source of sexual pleasure for the male.

The average length of a grown man's penis is between .\ and 4 iiuhv, when flaccid and between 5 and 7 inches when erect. However, there may be great variations in size from one individual to the next. Contrary In H>IW widely accepted myths, the size of the penis is not related to a man's body build, skin color, or sexual prowess. A very short man may have a larger penis than a tall one (and vice versa), a white man may have a larger f*>ms than a black man (and vice versa), and a man with a small penis may have more orgasms than a man with a large penis (and vice versa), Rmhomune, some penises which greatly differ in size when they are flaccid may be ot identical size when they are erect.

For reasons that are not entirely clear, many men in out culture seevu concerned about the size of their penises. However, such concern is cum pletely unwarranted. Even a penis that remains relatively small during an erection serves every function of a larger penis. A woman's vagina, for instance, adjusts to any penis, no matter what its si/e, and since the vaginal walls contain few nerve endings, any difference in the woman's sensations depends on the firmness of her muscles surrounding the vaginal barrel as wel! as psychological factors. (For details, see "The Female Sexual Response.") The latter is also true for sensations inside the rectum during ana! intercourse. There is practically no feeling at all beyond the anal sphimtt-r muscles. (This, incidentally, is the reason why some people who introduce long and hard objects into their rectum may seriously hurt themst-lves without realizing it.)

The urethra is a single tube which leads from the bladder to the tip of the penis. (The urethra should not be confused with the two ureters which lead from the kidneys to the bladder.) In the male, the urethra serves two important functions: to release either urine or semen. (Because of certain muscles, urine and semen cannot be released together.) While the urine enters the urethra directly from the bladder, the semen is composed of several different fluids which enter through special openings in the urethral wall mainly in the region of the prostate gland.

Below the prostate gland, there are two small glands about pea size which during sexual excitement secrete a clear, alkaline fluid into the urethra. Often a small drop of this fluid can be seen at the opening of the penis well in advance of an actual ejaculation. It is not entirely impossible for the drop to contain some stray sperm cells. (This could account for the rare cases of pregnancy without ejaculation of semen.)

The average length of a clitoris in its unexcited state is less than an inch and most of it is hidden from view. However, in the state of excitement it may swell to twice its usual diameter, in a way, the clitoris can be compared to a very small penis/ and its glans, which is normally exposed, is extremely sensitive to the touch as it is studded with innumerable nerve endings. Unlike the penis, however, the excited clitoris does not protrude but retracts under its hood. The clitoris is easily excitable by mechanical stimulation, and it plays an essential role in a woman's sexual excitement. (For details, see "The Female Sexual Response/') 2b1af7f3a8