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Huh, actually according to WP:PORN this has been an issue before; an image was deleted back in '06 with the summary ""Image would trigger 2257 record keeping requirements"". While from the name of the image (creampiesex.jpg) it was obviously a form of ""explicit sexual material"", I wonder where the line is drawn when it comes to penis images... I suppose it's time to ask someone at the Foundation. —//2¢/Δ's/ 
Actually, upon further investigation of past 2257 discussions, it would seem that these images are probably not restricted. For example, the discussion here. An erection is probably OK, but ejaculation might not be. —//2¢/Δ's/ 

too many pics

one pic is enough to properly show this part of the male anatomy. I feel that this article is a bit excessive in displaying the penis. Also consider that too many pics might discourage readers from viewing this article.   

Exclusively human

Non-human penises received only a fleeting mention. There needs to be more about the function and physiology of penises in other animals. 129.173.162.58  "