Here is the quote from "Shepherding The Flock 2010.
"Offenses Requiring Judicial Decisions
2. Listed below are offenses that may require review
by a judicial committee......................
11. Evidence (testified to by at least two witnesses)
that the accused stayed all night in the
Same house with a person of the opposite sex
(or in the same house with a known homosexual)
under improper circumslances.- If questions
are raised regarding Scriptural freedom to remarry,
see 12: 12.
RE RE MARRIAGE :
12/12. In some cases adultery is not proved, but it is
established by confession or by two or more witnesses
that the mate stayed all night in the same house
with a person of the opposite sex (or a known homosexual)
under improper circumstances. The elders
should carefully consider the situation. Were the individuals
together all night? Were improper circumstances
involved? For example, were the two persons
alone? Is there evidence of a romantic relationship?
What were the sleeping arrangements? Even if adultery
is not established, it may be that the Christian
was involved in an immoral sleeping arrangement.
Although the elders cannot tell the innocent mate
that he is free to marry because adultery was not
proved, in view of the circumstances, if the innocent
mate is convinced that adultery did occur, the elders
may allow him to take responsibility before Jehovah
for obtaining a Scriptural divorce; if he remarries, no
judicial action will be taken."
Hopefully it may be applied with a dose of common sense. I remember a case where a young "sister" had an ardent suiter turn up at her flat . He had no way home that night and no where to stay so he slept in her armchair. Our practical old P.O gave them a dressing down when he saw them next day and sent him home with a flea in his ear. We did not believe anything had taken place and took no action. Another case might be different.