Noun
guilty pleasure (plural guilty pleasures)
(idiomatic) Something that brings pleasure but is considered taboo, unadvisable or lowbrow.
For the renowned sushi chef, it was a guilty pleasure to eat fish sticks drowned in tartar sauce.
Guilty pleasure states that although we may experience a feeling of guilt when buying expensive things we, at the same time, enjoy the feeling it gives us. Source: Internet
Guilty pleasure when traveling? Source: Internet