Squishing bugs and kicking cats is natural for some people, in the sense that they do such things spontaneously, without reflecting on their actions. Nudity is the only natural state for animals, even humans. All clothing is artificial , that is, not natural . So are the fillings in your teeth. So is all make-up and jewelry.
Bearded men are natural.
To shave is to do something unnatural. Just because something is natural does not mean that it is good, safe or healthy. Herbs are natural but they are also drugs when used in the diagnosis, treatment, or prevention of a disease. The chemicals which comprise synthetic drugs are natural. If someone said that he preferred Irish whiskey to alcohol, we'd think he was confused.