'Natural' in the Bible

For this reason God gave them up to vile lusts; for both their females changed the natural use into that contrary to nature;

and in like manner the males also, leaving the natural use of the female, were inflamed in their lust towards one another; males with males working shame, and receiving in themselves the recompense of their error which was fit.

void of understanding, faithless, without natural affection, unmerciful;

if God indeed has not spared the natural branches; lest it might be he spare not thee either.