I want to share something I have found on a taoist site. Here we go: Does Size Really Matter? In male society, generally speaking, great emphasis is placed on the size of a man's penis. In male to male relationships, penis size is often equated with power, prowess, and ability. In fact, there is much truth to this. A very large penis indicates a superabundance of Yang energy, which is certainly useful on the battle field, for hunting, and other strictly male pursuits. However, in relationships with women, penis size is practically irrelevant. Much more important is that a man's penis should 'fit' the woman's vagina. There are, in fact, three different 'sizes' if you will, to be aware of. A woman may have a shallow Vagina, a medium sized one, or a deep Vagina. It is extremely important that the man's penis is the right size. A large penis needs a deep vagina and may even be damaging for a woman with a shallow Vagina. On the other hand a shorter penis will have trouble satisfying a deep Vagina. Fortunately, most of us are in the 'medium' range. From a healing perspective this 'fitting' is very important. Taoist healing art divides the penis and vagina into areas that correspond to the major organs of the body. This is common in all Chinese medical practices. Areas of the eye, the tongue, the ears, etc., all correspond to the 5 major organs. In sexual magic, the very tip of the penis corresponds to the heart. The tip of the tongue, by the way also corresponds to the heart. In the Vagina the order is reversed. That is the Heart area is located within the Vagina around the Cervix. This means that when the penis is inserted fully the Heart areas of each partner lines up. This 'heart to heart' alignment is very important. The other organs are represented like this; Lungs - around the head of the penis excluding the tip. Spleen/Stomach - along the shaft towards the head; Liver - along the shaft closer to the base; and Kidneys - at the base of the penis. The Vagina, as mentioned, is lined up in reverse. In a woman, the Kidney area is close to the opening of the Vagina. The Kidney areas then are lined up at full penetration and the other organs as well. In sexual intercourse then, with each thrust, the organs of each partner are stimulated and fortified. This makes not only for healing, but for full body involvement in the activity. If these areas then, do not line up exactly, an imbalance is created and sex can actually be harmful to the participants. So how does one know if a potential partner is a good fit? Apart from taking a test drive, so to speak, certain physical features may be good indicaters. The ideal penis is mushroom shaped and somewhere between 5" & 7" long. The shape and length of a man's thumb is often a good indicator of this. A man with mushroom shaped thumb will have a mushroom shaped penis. A man with pencil shaped thumb will have a similar penis. A man with a shorter penis will need a woman with a shallow Vagina. Do not worry if you do not fall into this range as there are exercises one can do to change both the shape and length.