Science Required Reading: Scientific American's Why Is The Penis Shaped Like That? (NSFW obviously)

Here's a question that probably anyone over the age of 16 has conciously or unconciously pondered but that is why people read Scientific American.

I was making my daily venture over to Metafilter when I stumbled upon a post called Secrets of the Phallus. As per usual, the most interesting elements of the page usually occur right below the actual post in the comments section as any snarky, blog peruser knows.

Comments like:

"I once spent a summer with a 450-pound silverback gorilla that was hung like a wasp

Haven't we all?" (from the amusingly titled user Blazeock Pileon)

or the joke:

"Q: Why do gorillas have large nostrils?
A: Because they have large fingers."

or my personal favorite from Sys Rq:

Gallup and coauthor, Rebecca Burch, conjecture that, “A longer penis would not only have been an advantage for leaving semen in a less accessible part of the vagina, but by filling and expanding the vagina it also would aid and abet the displacement of semen left by other males as a means of maximizing the likelihood of paternity.”

Wouldn't it simply displace the seconds-sloppiness into the goalie's crease? (I'd think outward displacement would have more to do with the bell-endedness than the bigness, especially since ye olde hooha is form-fitting.)

Besides, did such situations come up in human behavior frequently enough to evolve a smooth little monkey penis into the thingie we know and love today? Was Wilma Flintstone really that slutty?"

I guess when you're done reading the comments, you can read the actual article as well from Scientific American, "Secrets of the Phallus: Why Is the Penis Shaped Like That?"