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Size does not count for most women. In studies that have interviewed women, the majority say that size is not important in the amount of pleasure that is obtained through the sex act, particularly in comparison to other factors, such as attentiveness of the male to the female and the closeness of the personal relationship. It is true that there was a minority of women that said that they derived greater pleasure when having sex with men with a larger penis but there also was a minority of women that said that having sex with a man with a larger penis causes discomfort, and they do not prefer a man with a larger penis.
The primary determinant of penis size is genetics. Significant illness while young and organs are developing can influence any organ development, but this is only rarely an influence. Diet would not influence development unless there is significant malnutrition present. Once a man is an adult, there is no effective method for making the penis larger other than surgery, and surgery carries risk, so is usually only considered in men with a significantly small penis.
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