As another contributor here brought out, even evidence that a man and woman had spent the night together "under improper circumstances" can be used to find a JW guilty of immorality. But I know that it does not always bring a guilty finding.
I remember a case in which a somewhat mentally impaired woman had moved into a man's home for awhile because of having nowhere else to go. The elders involved looked at the situation pretty closely. It seemed clear to them (for a variety of reasons) that this woman and this man were not at all likely to be having sex. The chairman of that committee--himself a heavy hitting JW often used in appeals cases--made the statement...
"Just because an elder body can use this as grounds for fornication doesn't mean they must do so. In the absence of any other evidence that they are living "improperly," even though this arrangement is to be discouraged, we cannot take away her freedom to use her own conscience in this matter."
I remember feeling somewhat refreshed by this statement, since it seemed so different from typical JW puritanism. And now, remembering his words, "freedom of conscience," I have to wonder: how long before
he leaves this legalistic organization?