It's not hard to determine if a posterior is good enough. A good one will turn heads. But how do you get one? What makes up for a great butt? Here are some 7 traits that define the perfect butt, according to science. You can't argue with it.

First, it's the plump in the bump.

There's also the perkiness level.

You've also got to consider spine line.

Watch the video below. Very insightful!