'Natural' in the Bible

For this reason God gave them up to evil passions, and their women were changing the natural use into one which is unnatural:

And in the same way the men gave up the natural use of the woman and were burning in their desire for one another, men doing shame with men, and getting in their bodies the right reward of their evil-doing.

For when the Gentiles without the law have a natural desire to do the things in the law, they are a law to themselves;

For, if God did not have mercy on the natural branches, he will not have mercy on you.

For if you were cut out of a field olive-tree, and against the natural use were united to a good olive-tree, how much more will these, the natural branches, be united again with the olive-tree which was theirs?