It is carrying that which is lawful to excess that makes it a grievous sin.—Testimonies for the Church 4:505. (TSB 115.1) MC VC

Those professing to be Christians ... should duly consider the result of every privilege of the marriage relation, and sanctified principle should be the basis of every action.—Testimonies for the Church 2:380. (TSB 115.2) MC VC

Vital Importance of a Good Example—The animal passions, cherished and indulged, become very strong in this age, and untold evils in the marriage life are the sure results. In the place of the mind being developed and having the controlling power, the animal propensities rule over the higher and nobler powers until they are brought into subjection to the animal propensities. What is the result? Women’s delicate organs are worn out and become diseased; childbearing is no more safe; sexual privileges are abused. Men are corrupting their own bodies; and the wife has become a bedservant to their inordinate, base lusts, until there is no fear of God before their eyes.... (TSB 115.3) MC VC

Nothing but the truth of God can either make man savingly wise or keep him so. If there is an immortal life to be obtained, if a pure and holy character must be developed in order to gain entrance to the presence of the Lord God and the society of heavenly angels, then why do not teachers, physicians, and preachers act this in their example by their teaching? Why are they not more zealous for the Master? Why do they not have burning love for souls for whom Christ died? (TSB 115.4) MC VC