The ads show how the contents of the back pockets (keys, mobile phone) have left an imprint on the ass cheeks of the female wearing the extremely tight slim fit jeans.
The ads were created by Euro RSCG, South Africa.
Implications - The idea that sex sells has been prevalent in advertising for a very long time. The reason this idea exists is the fact that people are drawn to other people, whether that be in real life or on a giant billboard. Advertisers that use explicit images in their ads are going to gain a lot of attention because people can't help but look.