'Function' 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.

For even as we have many members in one body, and all the members don't have the same function,