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Logically speaking a larger and longer penis is superior in respect of a bigger harder erection. The erection seems to last longer and might be more easily attained, whereas an inferior penis does not react in the same way, because with the amount of blood the body pumps into the penis during an erection. This is often a scientific fact. Imagine the disappointment when becoming erect cannot be attained because of a mental crisis. This can so easily turn out.