I'm assuming that we would all understand that living together and having a sexual relationship would be sexual immorality.
Living together (with sex) is the same as saying "I don't love you enough to commit myself to you and marry you, but I love you enough to live with you and have sex with you." That is not love. What about if we don't feel guilty about some romantic or sexual activity we're doing?
Gen. "They shall become one flesh" refers not only to the physical union of two bodies, but the emotional intimacy that is part of that union as well. (Eph.-33) This was and has always been God's plan for romantic/emotional and sexual intimacy.
This sexual union is an intimate experience that is both emotional and physical. The "nakedness" of human beings was part of marriage and not to be exposed or viewed outside of the context of marriage after the fall.
A man and woman should be careful to keep from developing this romantic intimacy too early or too quickly before they married. What about "playing married" such as sleeping in the same room, sleeping in the same sleeping bag, staying in the same hotel room, living together (all of these activities without sex)?
It is like a rose bud that is opened in marriage and must be opened only a little before they are married, lest it develop their intimacy before the proper time. You are trying to have married intimacy and the benefits of God's wonderful plan of being married without actually being married, which God requires. If you are not mature enough to actually have gotten married, you're not mature enough to pretend your married.
Romantic intimacy is a warm closeness a man and woman share together on an emotional level as they love each other as husband and wife.
Adam and Eve were not to exist together without being married. a Christian marriage was also used as a picture of intimacy between Christ and His Church.It is by its very nature any physical contact, which stimulates a sexual response in either participant (even if nakedness is not uncovered).Sexual intimacy is not just an act, it is a whole process of developing physical intimacy.They felt ashamed and humiliated before the world even though at the moment no one else existed. In Gen. God Himself recognized their need for covering their nakedness and clothed them.Covering our nakedness from others is ordained by God.