And do not be conformed to this world (any longer with its superficial values and customs) but be transformed and progressively changed (as you mature spiritually) so that you may prove (for yourselves) what the will of God is, that which is good and acceptable and perfect (in His plan and purpose for you). Romans 12:2
We are living in this world, but we should not act like it. As we grow spiritually and continue to follow Jesus, we will be convicted of the things that were once considered acceptable, and because of our love for Jesus, we will stop the behavior. As we mature spiritually, we will discern what His will is for our lives and live according to His plan, not ours. What the world says is ok, is not ok according to God’s word. And when we are seeking His will, if we seek Him with all of our heart, we will find him and will know truth. This truth will allow us to separate ourselves from the world.