It's a bit of a guilty pleasure...

Meaning

I enjoy something even though it's perhaps not considered sophisticated or healthy.

Examples

• John: I saw you eating a whole box of chocolates yesterday.
• Alice: Oh, that. <b>It's a bit of a guilty pleasure</b>, I'll admit.
• John: Nothing wrong with a little indulgence now and then.
• Alice: You're right! But still, <b>it's a bit of a guilty pleasure</b>, isn’t it?