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 circumstances, is acceptable. (Elders manual) not a single scripture, no 2 witnesses, assumes fornication/adultery happens only at night)
What is even more screwed up is that IF the lights are on in general day use areas of the house for the entire night they will not presume that sex happened. I know this first hand.
I remember the old joke that the only sex approved by the GB is Friday night, after the meeting, in the dark, using no hands, and only missionary position. Sadly way to many jdubs feel that same way!