Love begins with selfish motives, but ends in selfless acts.
Relationship (man to woman) is as precious as a relationship between yourself and your God--it is simply needed. Relationship is a personal, private niche that is meant to teach on all levels, but more so to teach the practice of selflessness or learning to deny oneself for the pure enjoyment toward someone else. It is the practice of knowing that you are not your own, but indeed belong to someone else. Once one fully submits to the other there is spiritual insight that will begin to form. The two imperfectly meshed individuals form a utopian world of bliss, not only towards each other but also towards the God within them.