'Natural' in the Bible

For this reason, God gave them up to vile passions. For their women changed the natural function into that which is against nature.

Likewise also the men, leaving the natural function of the woman, burned in their lust toward one another, men doing what is inappropriate with men, and receiving in themselves the due penalty of their error.

without understanding, covenant breakers, without natural affection, unforgiving, unmerciful;

for if God didn't spare the natural branches, neither will he spare you.

For if you were cut out of that which is by nature a wild olive tree, and were grafted contrary to nature into a good olive tree, how much more will these, which are the natural branches, be grafted into their own olive tree?