What is the origin of the idiom "no strings attached" and when to use it?

The exact origin of the idiom "no strings attached" is uncertain, but it has been in use since at least the mid-20th century. The phrase metaphorically refers to the idea of a puppet or marionette not being controlled by strings, symbolizing the absence of obligations or conditions. It is commonly used when discussing financial transactions, contracts, relationships, or any situation where individuals want to emphasize the absence of additional responsibilities or consequences.