Even in Romans 6, it is found in verse 19. That being the case, we don't have to have the law like a club hanging over our heads to be coerced into doing right. We are not under the law in the sense that we are not under the penalty of the law. Now in the context of love and grace we render obedience. It makes us wonder about some people's concept of grace when they start emphasizing it, then let up on their devotion and consecration to the Lord.
Love is the fulfilling of the law in that the law is fulfilled in love and through love.
It involves the heart. But the letter of the commandment is not enough. We must from our hearts practice the very spirit of what Christ taught, and with what he taught there are principles and ramifications tied in with each command that cannot be ignored. They were not guilty of breaking this commandment. The law as such would not prohibit watching the garbage on television or the movies, but the teaching of Christ goes beyond the letter of the law, and would prohibit anything that would ensnare us in this way.