President Thomas S. Monson, Prophet and President of the Church of Jesus Christ of Latter-Day Saints, gave a talk at this last general conference called the "Three R's of Choice." Those three R's were right, or the right to chose, responsibility for our choices, and results of choice. In the course of this talk was given a quote from another earlier Prophet, David O. McKay who said, “Next to the bestowal of life itself, the right to direct that life is God’s greatest gift to man.”
Following this line in a more governmental secular sense, one could ask the question, "How does one reconcile these statements with the actions and stance of the church on issues like abortion and gay marriage?" Simple, we have have the right to life. Abortion is the violation of the right to life; the most supreme right we have as individual human beings, and as citizens. Abortion is the act of denying that right as a way of trying to eliminate the second "R" - responsibility for a previous choice. Of course church teachings do leave the room for the vary rare case of incest and more specifically, rape, as very slim exceptions to this rule. In the case of rape, where agency has been violated and serious harm, irreparable harm, is the only result - exceptions have rarely been made. In a largely universal sense, the right to life, the greatest gift to man, is most vigorously defended.
What then of gay marriage? If the right to direct that life is so great a gift, why keep someone from being able to direct that life without restriction? From my interpretation, I feel that this relates to the last two of the R's. Those who chose anything in this life have the responsibility for the results of our choices. Agency is not the principles of all choice and no consequence. If someone choses to disobey one or many of God's laws, that individual should expect to be responsible for the results of that choice. When someone choses to violate God's laws of chastity through homosexual acts, there are consequences. The issue of gay marriage is not about choice. The choice happened when the individual decided to be gay or rather to act upon homosexual tendencies.
Additionally, the right to direct ones life is a great gift, and "of whom much is given, much is required." Those who chose to act upon homosexual tendencies have directed their life, and that right is not lost - but their future altered as a result. What is lost are any benefits or blessings forfeit as a result of that choice. Those who commit sin seem to wish less of what is required of them, so in consequence, less is given. This includes the bond of marriage.
Life and choice are a gift. They have both been given to us. What lies before us is the chance to make the most of that life by seeking to put aside selfishness and base, physical desires, and to take upon ourselves a better life through obedience to the way of the Gospel plan - through following Christ's example. Those who are unwilling to overcome even the most powerful temptations are setting a standard far below their potential. In society today, many seek to reduce God's laws to suggestions, others call gospel teachings and principles unwise. I know that there is much I don't know - for such things I appeal to a higher, if not the highest wisdom. Seeking to follow a higher law leaders to higher and more desirable results.