Hidden in plain sight phrase
Used to describe something that is put in a place that is clearly visible
My favorite toy was hidden in plain sight, but I can't find it now.
To become important or obvious
The notion of "hiding in plain sight" originally developed in the 1600s as a military tactic that posited that soldiers could occupy any space on the open battlefield as long as they remained out of the line of view of their enemies. As weapons technology advanced and combat evolved beyond rank-and-file fighting, the concept expanded to include early forms of camouflage.
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.