Happiness, love, friendship, education, knowledge, ideas, virtues of all sorts. All of those things are not physical. The things that are most important to us don't exist in the physical world, but they really do exist. Well, I'll tell you what else is in this world. There are a lot of fun things in that world, too.
Sex is in that world.
Well, wait a minute, you say, sex is physical. That's one thing I know is physical. No, it's not. Think of this. Yes, it is.