Every so often I becomes suspicious that my wife (or one of my lovers) is cheating on me and I have the option to investigate.
However I don't see any reason why I would want to know if they are cheating on me.
If my wife is fertile it pretty much means that I want kids (if I didn't I would have married someone infertile in the first place). And since my wife has not given birth yet when the event occurs I can't even know if the kid has good traits or not.
It seems that the best option is always to put my fingers in my ears and pretend the kid is mine so that I can expand my dynasty or possibly get a good heir.
Is there any reason I could have to want investigate my wife for infidelity?