'Natural' in the Bible

This is why God delivered them over to degrading passions. For even their females exchanged natural sexual relations for unnatural ones.

The males in the same way also left natural relations with females and were inflamed in their lust for one another. Males committed shameless acts with males and received in their own persons the appropriate penalty of their error.

For if God did not spare the natural branches, He will not spare you either.

For if you were cut off from your native wild olive and against nature were grafted into a cultivated olive tree, how much more will these—the natural branches—be grafted into their own olive tree?