Someone who could make his life complete and meaningful. Adam was too much below God to have perfect fellowship with Him, and too much above animals to have fellowship with them. For this reason , God made Eve out of Adam so that she might be a part from him but very much of him. She could have fellowship with him as no other being could have. This oneness involves the whole being of both person's - physical, spiritual, emotional, volitional, and intellectual.
Premarital sex has a tendency to devastate the entire personality.
Fear, mistrust, self-denouncement and guilt are the inseparable companions of promiscuity. They ravage one's moral fiber and break down one's trust in himself as well as others. It is a dangerous things to invite fear, guilt and mistrust into the honeymoon cottage. You would not wear a dress or a suit that is half clean and half dirty. Blessed are the pure in heart for they shall see God.