Home bird British informal noun
Used to refer to someone who prefers spending most of their time at home
Ben is a home bird. He usually declines all invitations to hang out on weekends.
He had always been a home bird, until he met Jane, who is a social butterfly.
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.