Cars are, for many people, a necessary transportation method. For others, they can be a status symbol; a Ford Mustang is very different from a Nissan Altima. The opportunity to drive a luxury vehicle isn't given to everyone every day. If you suddenly found yourself with access to one wouldn't you take it out for a spin?
He writes:
My girlfriend (28F) was traveling and asked me (30M) to stay at her place and look after her dogs. She told me I could use her car for anything I needed during my stay. She has two cars and did not specify which one, the Porsche 911 GT3 or the Toyota Camry.
I used the Camry most of the time but took the Porsche for a short road trip to a hiking trail, and I hired a dog sitter that day. I had fun with it in an empty field, but nothing too extreme or over what the car is rated for.