I commend you for choosing to live in such a way that harms nobody. This is a noble desire. However, I would suggest that it does not go far enough. While virtue does involve not wanting to harm others, if it stops there it is entirely deficient and based upon one's desires to make up his or her own morality. It makes one feel as if they are being somewhat moral while still allowing them to ignore the weightier demands of love for God. They think to themselves, "I'm not that bad." In other words, they're somewhere between Mother Teresa and Adolf Hitler. This allows them to evade the question, "But am I truly good?" The absence of harm is not the same as the presence of virtue.
In fact, you may be interested to know that the slogan "Harm ye none" is actually the motto for the ethic followed by those who consider themselves to be witches! It's a neo-pagan moral code that has become so popular that one can even purchase "Harm Ye None" pentagram necklaces on the internet! It has to make you wonder if this is a good standard of morality if it is such a popular phrase among those involved in paganism, Wicca, and the occult. In my opinion, this idea of morality could be thought of as Christianity without the cross.
If your standard of morality is that an action not harm another, would you say that blasphemy causes harm to anyone? What about lust in one's heart? How about pride, greed, vanity, coveting, jealousy, or hatred? Jesus says, "You have heard that it was said, 'You shall not commit adultery.' But I say to you that every one who looks at a woman lustfully has already committed adultery with her in his heart. If your right eye causes you to sin, pluck it out and throw it away; it is better that you lose one of your members than that your whole body be thrown into hell. And if your right hand causes you to sin, cut it off and throw it away; it is better that you lose one of your members than that your whole body go into hell" (Matt 5:27-29).
God's standard for morality is very different than "harm ye none." For anyone who claims to be a Christian, these verses have serious implications. It shows that a person's sins that do not directly harm others can still cause harm to one's own soul.
One of the effects of person sins is the weakening of one's will. For example, some may say, "Well, I could stop masturbating, but I just don't want to." The absence of the desire to stop reveals the state of the heart. Deep down, it really does not care about pleasing God. It wishes only to please itself. Because of this, it has not experienced the freedom and joy God wishes to give it. Instead, it opts for passing physical pleasure and a false notion of sexual freedom. Such a soul misses out on so much because it believes that a life of virtue could never be more rewarding than habitual sin.
While giving a retreat to college students, Pope John Paul II challenged the young men with words that apply to everyone: "Christ is found particularly in the field of sexual morality, because it is here that Christ makes demands on men. We are quite ready to take, or conquer, in terms of enjoyment, profit, gain, and success. Then comes the question of giving, and at this point we hang back, because we are not prepared to give"[1].
Turn to Christ, who will give you the strength to be pure. Such a life will not only not harm others, it will glorify God and gain you merit in heaven.
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[1]. Karol Wojtyla, The Way to Christ (New York: Harper & Row Publishers, Inc., 1984).