What is a spank bank?

A "spank bank" is a slang term used to describe a mental collection of sexual fantasies or memories that a person uses for arousal or masturbation. This term is commonly used to refer to sexually stimulating thoughts or images that someone may mentally store for later use when they are seeking sexual gratification. The term originated from the idea of saving or storing these fantasies in a metaphorical "bank" for future use. It is a private and personal collection of erotic material that an individual uses for their own sexual pleasure. The content in a spank bank can vary widely from person to person and may include memories of past sexual experiences, fantasies, or images and videos that are mentally stored for arousal. It is often a way for individuals to explore their sexuality and fulfill their sexual desires when alone.