Couples who live together before marriage should sleep in separate rooms, and maintain self discipline.
I wouldn't advice such a thing. But what if one of them lost their job and couldn't afford to pay rent? Wouldn't they feel hurt if the person they are dating didn't offer to help.
But then, the other person would be taking on a big responsibility to have this person live with them rent free and bills free. I wonder how long that would last? It may be a while before the person finds employment.
Then the added stress of the people at church accusing them of living in sin- even though they may stay in separate rooms.
It would be ideal if the person was able to pay rent for their girlfriend/boyfriend until they were able to. But again I ask, how long will it be before the person finds employment?
So people move in together because of econimical reason. Then they're traped. In the back of their heads they don't want to marry because they are too poor. At least living together, you can easily end things whenever you want and move on out of the bondage. But to get married seems like prison when you're poor and struggling. Maybe that's how they look at it. They don't want to be tied down. The fact that they can move on at any time gives them peace.
(And another thing. What is better: to be single and struggling financially, or married and struggling?)