What is the origin of the idiom "kiss and tell" and when to use it?

The phrase "kiss and tell" has its origins in the late 17th century and gained popularity in the 18th century. It refers to the practice of sharing intimate or scandalous details of a romantic encounter or relationship. The phrase captures the idea of someone engaging in a passionate experience, such as a kiss, and then revealing the details to others. It is used to describe the act of publicizing or sharing intimate or personal information about a romantic or sexual relationship, especially when it involves disclosing private details to others for personal gain or attention. It implies a lack of consideration or respect for privacy.