This is where I am coming from:
Romans 8:13- "For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live."
As long as the flesh is in control- you can't experience life to the full potential. The more the deeds of the body are mortified- the more life you can experience. Marriage is the only place where sex is a spiritual act as well as a physical one. I guess two people who are in love truly are basically married- but the problem with not being married is that there is no way to know the other person's mind. In a marriage covenant at least a commitment has been made. In a marriage sex is holy so it will not bring you down.