OMG, I didn't know that keeping cats indoors could make them have a boring life!!!! yeah right......
Well, my Blueberry is strictly indoors, and he seems pretty happy to me. He actually is kind of afraid of going outside, so he's fine like this.
I wish there are no stray cats out there, they have a very short life. I sometimes see cats dead on the streets, how do we prevent that? By keeping them indoors and spaying or neutering. If you just let them have unwanted litters, all that creates are more cats, with the many chances of being killed.