I have been trying to follow this thread and to be honest my head is spinning. I answered one of the spin offs already, but wanted to provide some thoughts to yours as well.
God reveals himself to us through any number of means, primarily through the teachings of the Church, Tradition and Holy Scripture. In the Church is the fullness of revelation revealed, meaning that the Church holds the fullness of Truth. That does not negate revelation coming from other avenues as well, but it will always be only partially received and understood.
Scriptures are divinely inspired although written by human hands, we believe that the Holy Spirit guided the authors in the revelation and fullness of Truth contained in them as the Word of God. The Church has always taught that the Church has as part of its mission the duty and the right to interpret Scripture and to supervise the interpretation in order that its integrity may not be damaged and erroneous interpretations be given. However, it also encourages the reading and study of Scripture. I woudl add with a reliance on the writings of the Church as well as to how these are interpreted and why. The Bible is a complilation of divinely inspired revelations that tell the story of our Salvation among other things. While some things are to be taken literally not all things in the Bible are meant to be interpreted literally or need to be. They represent a truth in their telling but it may not be historically true -- for example, the importance of the Genesis stories are that God brought the world and everything in it into being and he created Man in his image. Perhaps the links below will help. I would also refer you to the Catechism, which can also be searched online. I provided a link for this as well for the search for the Interpretation of Scripture.
In regard to the premarital sex thing, I am too confused over what the point was or not to effectively address it. But, I will point out that love for another person can be shared without sexual intimacy, and despite how much we believe we love another person, engaging in sexual intimacy without the committment and surrender of marriage, we are cheapening the gift of that intimacy and we are ultimately cheating ourselves of the truly exquisite gift of that intimacy. As a result, it can lead to disappointment and a sense of devaluation of both the self and others, and ultimately leaves one empty rather than fulfilled and renewed by the encounter. It is in this way, sex can become an addiction like any other drug, seeking more and more to grab the transitory illusion of its benefits, because the enjoyment is only superficial and momentary in this type of encounter. In addition, the risk of creating a life and then because of the instable nature of the relationship to begin with, that child grows up without the benefit of a strong, stable and loving foundation, is enough reason to avoid succumbing to the temptation.
Like I said, I am totally confused by this thread, but perhaps some of the above will help. If it doesn't please feel free to disregard it as the ravings of a confused but well meaning contributor.