With reckless abandon phrase
Used in a situation in which someone does something in a very wild and reckless way
Having no time to waste, Jane worked with reckless abandon.
He made a decision with reckless abandon, without caring about the consequence.
The origin of this phrase is not clear.
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.