I think people started enjoying it a lot about 16 or 17 years ago. But it is not something every Japanese person enjoys!
As for this photo, I took it at a train station. This is a replica of the famous statue in Belgium, "Manneken Pis".
But this one is not naked. Every months, the volunteer group people prepare a new costume for him. Right now, he is wearing a fireman uniform!
So, I think he is fighting against a fire. He has a flag "Fire Prevention Campaign" So, he is working like this!