As with any natural function, you must do it yourself.

What a bizarre way of looking at a natural, organic function!

Apparently they did not release him even for natural functions.

To hear them talk one would have thought they had no legs, natural functions or knowledge of the wicked world.

Or perhaps it was her body, ready to exercise its natural function, which had wanted the child.

"It is just not a natural function for a city to maintain such a large prison population," he added.

But what would happen when he wished to perform a natural function?

Given that singing is a natural function of the human body, it's remarkable how few people can do it.

They are a natural function of that planet down there!