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Scientific studies suggest that the average male penis is approximately 6" in length when erect - some studies say it's slightly shorter. Some women may prefer larger penises but according to science, they are quite rare. Out of 100 men, only 5 would have a penis larger than 16 cm (6.29") while erect. Also, only 5 out of 100 men would have a penis smaller than 4". It's also noteworthy to mention that the average vaginal canal is 5" deep. In a lesbian relationship, a male's size is of no consequence whatsoever.