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The new study, on the other hand, is the first to use 3D printed models , which meant women could physically handle them, Leung said. For one-night stands, size does matter, but it's not penis length that women are concerned about — it's girth, a new study suggests. But there was no difference in length between the penises they preferred for one-time partners versus those they preferred for long-term partners: The vagina has many pressure-sensitive nerve endings that detect sensations of stretching, and these sensors may be finely tuned to detect variations in penis girth, the researchers said. The models were blue, and ranged in size from 4 inches long and 2. They were then asked to pick that same model from a bin of 33 models, either immediately or after completing a minute survey to allow time to pass.