This male's erection is a half inch shorter than the one in the picture above. Yet I suspect that most viewers might think it is longer. That perception is probably based on the strong upward angle.  Perhaps seeing the lower surface of the erection as it transitions into the scrotum gives an impression of greater length.  The viewer doesn't know exactly where the erection shaft ends and the scrotum begins.  At any rate this is a look that receives approval by many viewers - it's probably what most people "expect" an erection to look like.  The man standing here is 33 years old, 6 ft., and a slim 155 lbs.