I had not looked at my right hand so closely since high school days when my friends and I tried to divine each other’s future. The middle finger stood tallest, followed by the ring finger and then the index. In my other hand, I held a science magazine with an illustration of a “masculine” hand. It looked like mine. Apparently, the index finger on a typical “feminine” hand is almost the same length as the ring finger.

The magazine went on to say what the implication of the long ring finger was: I had received more testosterone in my mother’s womb. Estrogen would have made my index finger longer. Finger lengths are obvious indicators of hormonal activity at a crucial time in fetal development.

There are hundreds of studies linking finger length ratio to pretty much everything: behaviour, cognition, personality traits, length and size of body parts, diseases, and more. According to one study, people with my kind of hand are more likely to show mental toughness, optimism and aggression. My “masculine” hand predisposed me towards drug or alcohol addiction, left-handedness, athleticism, and a disinterest in babies. My chances of landing in prison, going mad, or being murdered were high.

Another study suggested that people with male hands were less adept at gauging the moods of people in photographs. As a film editor, I had cut between shots of actors’ faces to accentuate drama, comedy, and pathos in innumerable scenes and episodes of television series. Had I done this without being able to read faces? Give me a break.

I researched where a feminine hand would take me: high risk of breast cancer, schizophrenia, eczema, and hay fever. A longer index finger also indicated the person had better verbal and literary skills. Did I blow my chance of being a good writer while still in my mother’s womb?

I measured the two offending fingers on my right hand since it is more sensitive to prenatal sex hormones than the left. Dividing the length of the index by the length of the ring finger gave me a ratio of 0.95, an average male hand. Women with feminine hands should have a ratio close to one since their index and ring fingers are close to equal length.

It even works in animals. Rats injected with testosterone produce babies with longer fourth digits in their right foot, which would correspond to ring fingers in our hands. High ranking female rhesus macaques had longer ring fingers than lower ranking ones, said one study.

Then came the surprise: long ring fingers make us a successful species. Besides using fire, humans are unique in their ability to throw missiles, such as spears and with slingshots. Having long ring fingers stabilises the middle finger, which provides greater accuracy in hitting the target, said one study. It’s possible that men with long ring fingers, who brought home the bacon more frequently, were preferred mates.

Our destiny is in our hands. But I remain unconvinced. Some studies were drawing conclusions from examining a few people. Many results were contested by others. The methodology was inconsistent: some measured left hands, while one got impossible ratios. It’s possible some of these traits, even finger length, could be inherited. Reading these studies was more entertaining than enlightening — like reading personality types according to zodiac signs.

When my eyes were bleary from reading too long, I said to Rom: “The finger ratio can tell two things — prenatal exposure to sex hormones and maybe sexual orientation.”

Rom asked: “And?”

“And what?”

“What’s your sexual orientation?”

“Possibly lesbianism,” my voice dropped a notch.

With a broad grin and a suggestive look, he commented: “That could be interesting.”

Unwilling to go down that path I pushed back: “In your case, your finger shows your stupidity.”

Rom held up his hand calling for a ceasefire. In the 1960s, he had been bitten by a prairie rattler and his index finger was obviously stunted.

A report by Janaki Lenin


Ron Jeremy, adult actor.

 JULY 4, 2011 – Finally… the long waited proof is now available: Korean researchers from the In Ho Choi of Gacheon University Gil Hospital, have pointed out that the popular ‘digit ratio‘ does correlate with penile length!

Finger professor John T. Manning had already pointed out in his second book ‘The Finger Book (2008) that a Greek study in the Naval and Veteran’s Hospital of Athens (2002) had pointed out that the length of the index finger correlates with the length, glans & volume of the penis. Manning commented (in ‘The Finger Book’):

“Spyropoulos and his collegues did not measure the remaining fingers, so we cannot be sure of their relationship to penis length. My guess is that they would have found the ring finger the strongest predictor, and that long ring fingers in relation to index fingers would be associated with longer penises.”

The new Korean study shows that John Manning – the ‘finger professor’ – was right… again!

Psychologist John T. Manning, a.k.a. the 'finger professor'.

The researchers from Korea found that the ratio between the second and fourth digits on men’s right hand correlate to the length of his flaccid and stretched penis. A lower index-to-ring finger length ratio indicates a longer (stretched) penis.

NOTICE: The table below is taken from the scientific article; it e.g. illustrates that likewise results were found for body length and penis length – for the ‘flaccid condition’ the result for body length were slightly higher than for the 2D:4D digit ratio, but in the ‘stretched condition’ finger length ratio was a better predictor for penis length!

The key to this relationship may lie in the womb, a team member added:

“During the fetal period, high concentrations of testosterone lead to high testicular activity, resulting in a lower digit ratio, in the present study, patients with a lower digit ratio tended to have a longer stretched penile length.”

The researchers also added that the length of the stretched and flaccid penis does show “a strong correlation” with an erect penile length.

The Korean report was published on july 4 in the Asian Journal of Andrology, and the scientific article is available at Nature.com.


How can we understand this correlation between finger lenght and penis length?

Let’s take a look at the hands of one of the biggest ‘stars’ in the adult industry today: Ron Jeremy. Jeremy is today known as the ‘best performing’ male adult star ever, he is e.g. listed in the Guinness Book of World Records for “Most Appearances in Adult Films”, and he is noted for his 9.75-inch (~24.75 cm) penis (self-reported according Wikipedia).

How about his hands? His handprints are display at the entrence of Hustler’s Hollywood,  at the ‘Porn Stars Walk of Fame’ in West Hollywood, California – see the picture below. His 2D:4D digit ratio is estimated at 0.85… which is exceptionally low for a caucasian male!


‘Hands of fame’ – The hands of 93 celebrities & famous people!

Handprints of Ron Jeremy, adult actor.

Portrait of Giacomo Casanova by Anton Raphael Mengs.
Portrait of Giacomo Casanova by Anton Raphael Mengs (1768).

‘Giacomo Casanova had the long ring finger!’

Numerous references to variations in finger length patterns are found in the history of literature. However, none of the revelations are more lively than the informative comment in the memoirs of Giacomo Casanova (Jacques Casanova de Seingalt, 1725-1798) – who has been described as ‘world’s greatest lover’. Casanova where he recounts a conversation with the painter Anton Raphael Mengas (Casanova, 1794).

Peters et al. (2002) reported that Casanova made 2 clear statements: first, that the ring finger is relatively longer than the index finger and, second, that this is the case for both men and women. What follows is a quote from the work of Casanova (The Memoirs of Casanova: Spanish Passions) about one of his conversations with the German neoclassic painter Anton Raphael Mengs.


… Once I dared to tell him that he had made a mistake in the hand of one of his figures, as the ring finger was shorter than the index. He replied sharply that it was quite right, and shewed me his hand by way of proof. I laughed, and shewed him my hand in return, saying that I was certain that my hand was made like that of all the descendants of Adam.

“Then whom do you think that I am descended from?”
“I don’t know, but you are certainly not of the same species as myself.”
“You mean you are not of my species; all well-made hands of men, and women too, are like mine and not like yours.”
“I’ll wager a hundred doubloons that you are in the wrong.”

He got up, threw down brushes and palette, and rang up his servants, sayin,-

“We shall see which is right.”

The servant came, and on examination he found that I was right. For once in his life, he laughed and passed it off as a joke, saying-

“I am delighted that I can boast of being unique in one particular, at all events.”

BBC Test: finger length & sex I.D.!
Finger length & Cupid’s science!
The science of gaydar: finger length & sexual preference!
What they say about men with long ring fingers!

Giacomo Casanova's 'History of My Life' - part 1 to 12.

Internet study confirms: finger length is linked with handedness!

Handedness & your finger length ratio

While a few years ago early studies had identified a link between various hand characteristics and handness, last year the link was ‘officially’ confirmed in an Australian study that had used a new method for measuring finger length ratio. Now a new BBC internet study by the ‘finger professor’ John T. Manning has confirmed the earlier findings.


Digit ratio (2D:4D) and hand preference for writing in the BBC Internet Study.


“The ratio of the length of the second to the fourth digit (2D:4D) may be negatively correlated with prenatal testosterone. Hand preference has been linked with prenatal testosterone and 2D:4D. Here we show that 2D:4D is associated with hand preference for writing in a large internet sample (n>170,000) in which participants self-reported their finger lengths.”

“We replicated a significant association between right 2D:4D and writing hand preference (low right 2D:4D associated with left hand preference) as well as a significant correlation between writing hand preference and the difference between left and right 2D:4D or Dr-l (low Dr-l associated with left hand preference).”

“A new significant correlation between left 2D:4D and writing hand preference was also shown (high left 2D:4D associated with left hand preference). There was a clear interaction between writing hand preference and 2D:4D: The left 2D:4D was significantly larger than the right 2D:4D in male and female left-handed writers, and the right hand 2D:4D was significantly larger than the left hand 2D:4D in male and female right-handed writers.”


The origins of handedness
Your fingers reveal so much about you
The finger book – BOOK
Your left handed child – BOOK

What your hands reveal, what your eye may not see!

Finger length measurements.

Are you tall, short, or got a small head?
Don’t forget to take a look at your fingers!

Recently Roger Dobson – author at MailOnline.co.uk presented an informative article with the title: ‘Tall, short – or got a small head? Here’s what your physique reveals about your health’. The article describes how various body dimensions – varying from body length to foot size – can indicate useful information about your risk of developing certain conditions, varying from cancer through to dementia & heart disease.
The continuation presents a quote from Roger Dobson’s article about the 2D:4D digit length ratio – the hand characterstic that has become very well-known in the past few years through the work and the 2 books of ‘the finger’ Professor John T. Manning

Roger Dobson wrote in his article about the hand:


Autism and ADHD, mental illness/depression

A range of disorders has been linked to the length of fingers, and in particular the ratio between index and ring fingers. The ratio is thought to be a marker of what was happening hormonally in the womb when the foetus developed.

It’s thought a relatively long ring finger is a sign that the foetus was exposed to higher levels of the male hormone testosterone, while a relatively long index finger is a marker of the female hormone, oestrogen.

Conditions associated with a long ring finger compared to the index include autism and ADHD. Those associated with a longer index include depression.

Males, who are more likely to develop autism and ADHD, tend to have a longer ring finger relative to their index finger.

Exposure to certain hormones might increase or reduce the risk of certain conditions and traits.

‘It has been suggested that autism may arise as the result of exposure to high concentrations of prenatal testosterone,’ say researchers at Liverpool University.”

The fingers of Albert Einstein.

The fingers of Albert Einstein.

Albert Einstein has a ‘2D:4D finger ratio’ of 0.93:

In 1930 a German hand reader, Marianne Raschig, has taken the handprints of Albert Einstein (he was born in Germany) and one year later they were presented in her book: ‘Hand und Persönlichkeit’.

Almost 80 years later the ‘2D: 4D digit ratio’ (ratio between the index finger & ring finger) is now measured from the high quality handprints.

Einstein had a ‘2D:4D finger ratio’ of: 0.93

The high quality handprints of Albert Einstein can found in the article:
Handprints: the hands of Albert Einstein

The picture below is also taken from the German book. The results of a detailed measurement procedure (taken by a Dutch psychologist) indicates that the ‘2D:4D digit ratio’ is for both hands: 0.93.

This is especially interesting because researchers at Cambridge and Oxford universities believe Albert Einstein displayed signs of autism (Asperger syndrome). Earlier research on finger length & autism has indicated that a low digit ratio (0.94 or lower) highers the chance for the presence of autism!

Therefore it seems fair to conclude that the fingers of Einstein provide evidence which support the perceptions of the UK researchers who suspect that Albert Einstein had autism!

The handprints of Albert Einstein.

What can we learn from our fingers & finger length?
The curved little finger & autism
Finger length (low digit ratio) related to autism
More fingerprints news
Global news about hand reading & palmistry

Finger length.

Finger length appears to be related to body height.

Finger length relates to body height:

Earlier this year a Turkish study reported that in a sample of 386 right handed students, body height was found to correlate negatively with the right- and left hand digit ratios (significant for the left hand in men, and the right hand in women). This implicates that in both males and females evidence was found that a ‘low digit ratio’ is more frequently found in people who has a long body height.


‘Finger Guru’ John T. Manning presented in his first book Digit Ratio an overview of data related to the ‘digit ratio’ in various populations. This data (Manning, Barley, et al.; 2000) points out that e.g. in Spanish & British people (both populations for both men and women) a significant HIGHER ‘2D:4D digit ratio’ (the ratio between the index- and ring finger) was found, compared to for example the finger ratios in Finish & German people (again in both populations for both men and women).

Interestingly, especially Spanish people, and in a lesser degree British people as well, are known for their (relatively) short body height – while Germans & Fins are known for their moderelately longer body height (compared to the Spanish & British): see the figure below. This implicates that there appears to be a strong link between the Turkish study which was published in 2008, and the earlier population evidence mentioned by Manning!!

Body height in various populations.

Height, digit ratio and sex differences
The finger book
7 Milestones in the history of finger length research
Finger & digit ratio news
More hand news