For I know that nothing good dwells in me, that is, in my flesh. For I have the desire to do what is right, but not the ability to carry it out.
Romans 7:18 ESV

This is hyperbole, which Paul and Yeshua both used freely. Obviously, there is much about our bodies that is good or God wouldn’t have made them, and even the most wicked people often do good works.

However, the evil inclination in our flesh consistently pulls us downward. If we allow it to be our masters, then we will be little more than animals. If we rule our flesh, we can direct it to much good, including through our physical passions. Our spirits and the Law of God must be the guide for our passions, not the other way around. See Proverbs 25:28 and Hebrews 4:15-16.