Separate from Uncleanness

Initially in chapter 15, God declared to Moses and Aaron how to deal with sexually transmitted diseases, but then He continues and declares that normal acts also make you unclean including laying with your spouse and the menstrual cycle. These things that are normal still make one unclean and cause others to be unclean. It makes it clear that the uncleanness is not sin, since non-sinful acts still produce uncleanness, The picture is more that from our flesh is where sinfulness and uncleanness arises. We need to be spiritual and not just carnal or we are unclean in the sight of God.