Where did the term girl next door originate?

The term "girl next door" originated in the mid-20th century, particularly in American pop culture, referring to a wholesome, approachable young woman who embodies innocence and charm. It typically evokes the image of a friendly, attractive girl living nearby, someone relatable and down-to-earth. The phrase became popular through various media, including film and literature, where such characters often served as love interests. Over time, it has come to symbolize an idealized version of femininity and neighborly qualities.