6. Developers favor exaggeration over realism (when it comes to boobs)
Ninja Gaiden Sigma 2 is an enhanced version of Ninja Gaiden 2, with improvements to the camera and the ability to shake the Sixaxis controller to make boobs jiggle. Seriously. You're able to make the characters' DD breasts flop around unrealistically, ignoring gravity, physics, and the women's rights movement all with the literal flick of the wrist. At some point, someone thought this was a good enough idea to not just test, but actually include in a game that would ship and be sold in stores.
Problem is, Ninja Gaiden Sigma 2 isn't the exception; even when games don't have tacked-on boob/motion control, they usually favor totally insane breast physics that would quite literally break the back of your everyday woman. Sure, live action films and television shows try to sex up female characters, but they're still tethered to pesky reality, something game developers don't have to worry about. They have complete control over the bodies of their characters, which usually leads to women that look more frightening than attractive, even without factoring in the aforementioned uncanny valley.