And now these were attempting to justify it by claiming freedom. But, Paul says, the use of your liberty cannot go to the point of slavery. That would be a denial of very freedom you profess. But they had another excuse. Never mind that it is God who created us with the appetite, and it is God who defines the context in which that appetite is to be satisfied.
Marriage is honorable, and the bed undefiled.
God has laid claim to everything about you, You have pledged the same to him in your faith and in your baptism. You belong to God, and your body is to be used for Him. Now of course the problem is much more serious than this, and Paul will make that plain shortly. But before we get to that, notice something very modern and very common about this situation as he deals with it. This is always the case.