"know somebody in the biblical sense"の定義と意味

What is the origin of the idiom "know someone in biblical sense" and when to use it?

The idiom "know someone in the biblical sense" is believed to have originated in the 19th century. It is thought to be a reference to the Bible's many mentions of sex, which are often very clear and direct. The idiom is commonly used to mean that someone has had sexual relations with another person, and it is often used in a humorous manner. It implies a deep and intimate knowledge of someone on a physical and personal level.