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Measuring Testosterone Levels
According to University of Liverpool researcher John Manning, the size of your ring fingers and genitals are directly related to how much testosterone you received in the womb; the higher the testosterone level, the longer they are. In fact, looking at the length of ring fingers in comparison to index fingers will give an idea of the size of a man's penis. If the ring fingers are longer, it means that there were healthy testosterone levels; if they are the same size or smaller, it means that there were lowered levels.