I'd say overall curviness, which to me isn't the same as just an ass. Some girls might have a big ass but the part just doesn't look like it fits with the whole package. Carmen is one of those women who has both going in the same and perfect direction.
I have this old clip of a blonde in a DP scene. I don't know her name. I attached a picture of her but you can't really see her face so I posted a link to download the video clip as well.
http://*****************/files/2fcpnb4e7
[Please Note: the attachment in this post has been deleted by...