Judging penis size

[JesusA (imported)]

Judging penis size by comparing index, ring fingers

By Thomas H. Maugh II

Los Angeles Times

July 4, 2011

Penis length cannot be determined by how big his hands or feet are -- those and other supposed indicators have been widely discredited for years. But now a team of Korean researchers has produced what may be a more reliable guide: the ratio of the length of his index finger to that of his ring finger. The lower that ratio, the longer the penis may be, the researchers wrote Monday in the Asian Journal of Andrology.

Dr. Tae Beom Kim, a urologist at Gachon University in Incheon, Korea, and his colleagues studied 144 men over the age of 20 who were undergoing urological surgery for conditions that do not affect the length of the penis. One member of the team carefully measured the lengths of the index and ring fingers on the subject's right hand before surgery -- left hands are thought to be more variable. A second team member then measured penis length immediately after the subject had been anesthetized. The length was measured both when the penis was flaccid and when it had been stretched as much as possible. Stretched length is thought to correlate to erect length, the team wrote. The team found that, in general, the lower the ratio of the lengths of the two fingers, the longer the stretched length of the penis.

Although it may seem like the results are coming out of left field, they actually are not. A variety of studies suggest that the ratio of the two finger lengths is determined by prenatal exposure to sex hormones, both testosterone and estrogen. It is not unreasonable to assume that penis length might also be.

Men and women are what is termed sexually dysmorphic in terms of finger lengths. In women, the index and ring fingers are generally the same length, while in men the index finger is generally shorter. Researchers from UC Berkeley created a stir in 2000 when they reported that lesbian women tended to have a ratio of the two finger lengths that was more typical of men. But the situation was more complicated for men. The team found no difference in the ratio between gay and straight men unless they had several older brothers -- a factor which had previously been linked to being homosexual. Such men were found to have an unusually low ratio of the finger lengths.

Other recent research has suggested that men with a lower ratio have a more symmetrical face and are more attractive to women, a phenomenon known as the "sexy ratio." And just last year, researchers from Warwick University and the Institute of Cancer Research in Britain reported that a man's risk of developing prostate cancer is related to the ratio of the two digits. Men whose index finger in longer than their ring finger were found to be one-third less likely to develop prostate cancer.

Digit ratios are noninvasive and easy to measure and thus may provide a surrogate for studying prenatal development in men, wrote Dr. Denise Brooks McQuade of Skidmore College in Saratoga Springs, N.Y. in an editorial accompanying the study.

http://www.latimes.com/health/boostersh ... 6505.story

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[JesusA (imported)]

Here’s the abstract of the original article:

Second to fourth digit ratio: a predictor of adult penile length.

Choi IH, Kim KH, Jung H, Yoon SJ, Kim SW, Kim TB.

Department of Urology, Gachon University Gil Hospital, Incheon, Korea.

Abstract

The second to fourth digit ratio (2D:4D) has been proposed as a putative biomarker for prenatal testosterone and covaries with the sensitivity of the androgen receptor (AR). Both prenatal testosterone and the AR play a central role in penile growth. In this study, we investigated the relationship between digit ratio and penile length. Korean men who were hospitalized for urological surgery at a single tertiary academic centre were examined in this study, and 144 men aged 20 years or older who gave informed consent were prospectively enrolled. Right-hand second- and fourth-digit lengths were measured by a single investigator prior to measurement of penile length. Under anaesthesia, flaccid and stretched penile lengths were measured by another investigator who did not measure nor have any the information regarding the digit lengths. Univariate and multivariate analysis using linear regression models showed that only height was a significant predictive factor for flaccid penile length (univariate analysis: r=0.185, P=0.026; multivariate analysis: r=0.172, P=0.038) and that only digit ratio was a significant predictive factor for stretched penile length (univariate analysis:r=-0.216, P=0.009; multivariate analysis: r=-0.201, P=0.024; stretched penile length=-9.201×digit ratio + 20.577). Based on this evidence, we suggest that the digit ratio can predict adult penile size and that the effects of prenatal testosterone may in part explain the differences in adult penile length.

Asian Journal of Andrology advance online publication, 4 July 2011; doi:10.1038/aja.2011.75.

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[JesusA (imported)]

There have been a great many studies of the relationship between 2D:4D finger lengths over the years. It is now well-accepted that there is a correlation of 2D:4D with pre-natal exposure to testosterone and that this can be a noninvasive way to measure T exposure before birth.

Penis length has already been correlated with pre-natal T, but so have a great many other things, including adult physical strength, sexual orientation, etc.

Here’s an article abstract from 2007 that demonstrates a correlation between penis length and criminality. The data in the article even support that the longer the penis, the more likely the crime to be violent.

Androgen-promoted physiological traits and criminality: A test of the evolutionary neuroandrogenic theory

Lee Ellis *, Shyamal Das, Hasan Buker

* Minot State University, Sociology, 500 University Avenue, West Minot, ND 58701, United States

Personality and Individual Differences (2007) 44( 3): 701–711

Abstract

According to the evolutionary neuroandrogenic (ENA) theory of criminal and antisocial behavior, androgens (male sex hormones) have evolved the tendency to alter brain functioning in ways that increase the probability of criminal behavior, especially for violent and other victimizing types of offenses. If the theory is true, criminality should be higher for males than for females and, within each sex, criminality should correlate with physiological symptoms of high androgen exposure. These deductions were tested with a large sample of North American college students. As predicted, crime was more common among males than females. In addition, among both sexes, numerous small but statistically significant positive correlations were found between self-reported criminality and androgen-promoted physiological characteristics. In particular, self-reported violent criminality was positively correlated with masculine mannerisms, masculine body appearance, physical strength, strength of sex drive, low–deep voice, upper body strength, lower body strength, and amount of body hair. Among males, even penis size was found to be positively correlated with criminality. Multiple regression revealed that it is possible to statistically eliminate the sex differences in violent crime by including the androgen-promoted physiological traits in the prediction equation, although doing so did not eliminate sex differences in other categories of offending.

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