Why Are Nice Pics/Gifs/Videos Called ‘Foo-Porn’? – Word Usage

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I was browsing Reddit and I discovered many subreddits named after foo-porn, to name just a few:

It seems that foo-porn means nice picture/gif/video of foo, which are absolutely suitable for work. As far as I know however, usually "porn" means "pornography". Actually, searching the keyword porn with Bing.com even gives me something like:

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My question is: Why are nice picture/gif/video about foo called "foo-porn", even if foo is completely not related to pornography?

Best Answer

A definition of porn could be gratuitous images/moving images of naked people and sex acts intended to excite and arouse. The use of foo-porn implies the use of this definition, but replacing "naked people and sex acts" with "foo".

From Cambridge Dictionary:

porn - pictures, books, television programmes , newspaper articles, etc. that are intended to be exciting for people interested in a particular subject or particular product