My girlfriend and I are tourists, and in Sao Paolo I was slapped and had my wallet stolen by a couple of teen guys. Should I tell police?

Seems like this is the best place to ask this question. My gf and I just graduated university, and took a two week trip to Brazil. Tomorrow is our last day and we had a great time. But yesterday, after we got quite drunk we made the bad decision to walk through a poor part of town. As we took a shortcut, we saw two boys, no older than 17, walking towards us. We're 5 years older but as one of them put a hand on my chest and pushed me against the wall, I realized he was stronger than me.

He asked for my wallet and I said I didn't have it. It was a stupid lie, said out of fear. He slapped my face so hard I lost my senses for a moment, and instantly gave my wallet to him. They then just began calling me a liar and slapping my face turn by turn until I began crying while they filmed it on a phone.

One boy then turned to my gf and said, "You really date this fa**ot? He put his hand on her face and kissed her on the lips for a full 15 seconds, before pushing me to the ground. He put his boot on my face and took a picture, then he knelt down and wrote "fa**ot" on my face with a pen and signed it as if he was branding me like an animal. They ran away laughing.

We are leaving tomorrow but two teen boys emasculating me like that as my gf watched was humiliating. Should I tell the police or just fly back home?