Preventative maintenance is tricky in all areas of life because we don't always know what we are preventing. Or better yet we don't know how much we are saving ourselves by doing the preventative maintenance. Life Groups can be the same way.
To gain the full advantage of how God has wired us, we must give other people access to our hearts now. If we don't, like David in 2 Samuel 11, we are capable of some terrible actions with some horrible consequences.
When we become less accessible, do we make better or worse decisions?
Are you willing to give some people access to your heart who can tell you "No"?