If you look at the uncropped original here, you can see what appears to be a firearm and bulletproof vest on the bathroom counter beside him. He's also wearing uniform pants -- you can slightly make out the seam stripe on the sides.
Underneath his wifebeater, he's wearing a foam skin guard, something that real cops wear under their body armor to prevent skin chafing. He also has a muscular physique, and real cops often are very physically fit.
If he's a real American cop, this picture could probably get him fired. He could be from another country, but that style of badge is typically only seen in the United States.
So his true identity will remain unknown as well as why this photo was made. Perhaps it was strictly private and only intended for his significant other but then later somehow made its way onto the Internet. I tried using Google's image search to see if this turned up anything but, alas, nothing.
The larger cropped version of this photo is archived here and the uncropped original is here.