"Kids often believe no one can see them when they cover their eyes even though they are hiding in plain sight. Turns out, a dark roomcan have a similar psychological effect on adults."
If the lights go off, so does the honesty. Cultural implications? discuss...
To sum it up, basically in low lighting we feel we can get away with more. Check the study
If you put two people in a room, of the same sex, that if the lights are off they are 84% more likely to kiss than if they had the lights on. Also, if you turn the lights off with the pair having had the lights on for 5 minutes already, they are 35% more likely to still kiss than if you had the lights off after 2 1/2 minutes.