Re: Marriage dilemmas
I believe there was one case, where 4 witnesses testified against this one guy they thought was cheating on his wife. They saw hints of him hanging out with other women, etc, but it wasn't enough to the court. They even saw the lovemaking scene out of a window looking into the window of this guy's place. Although they saw the act taking place, there was one of the 4 witnesses who was not sure if he saw another woman's face and could not say that he was not having sex with his own wife (the other 3 men had testified that they did see the lady's face, and it was not the man's own wife, it was another woman). The judge dismissed the case, since it didn't meet the 4 witnesses requirement.
This is a story, that I've heard numerous times and at different masjids as well. Which hadith its in, etc, I really don't know, but it was after the Prophet's time and during one of the caliph's times (I think). Maaf karna, but I don't have the exact source of this story. However, its one that is a common one that is told. I'm surprised you haven't heard of this?