| Assuming the average penis is 6 inches long with a diameter of 1 1/2 inches, that's a volume of about 42 in^3. 18,927 cm^3 in 5 gals
 688cm^c in 18,927cm^3 means you could fit 27 penises into a 5 gallon jug.
 
 But you would have to stack them just right.
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