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I cant. There is nothing to give me a sense of scale in the photo. Wait...I know....Copa...whip out your baby maker and hold next to it....that should give me a idea! lolz
Anyway...I prefer to look at a man's feet, not his hands.
The digit ratio is the ratio of the lengths of different digits or fingers typically measured from the bottom crease where the finger joins the hand to the tip of the finger. It has been suggested by some scientists that the ratio of two digits in particular, the 2nd (index finger) and 4th (ring finger), is affected by exposure to androgens e.g. testosterone while in the uterus and that this 2D:4D ratio can be considered a crude measure for prenatal androgen exposure, with lower 2D:4D ratios pointing to higher androgen exposure.