[userbinator]

I'm perplexed that someone would name a pornographic site with the same name as a very popular food additive.

[itishappy]

Great, now I am too. Thanks. Forgive me ad-sense recommendations, but I'm going in.

Looks like it's unconfirmed but likely it was specifically named for monosodium glutamate. "This is where we keep the tasty content."

https://en.wikifur.com/wiki/E621

https://www.dictionary.com/e/slang/e621/

https://knowyourmeme.com/memes/sites/e621

(Edit: Apparently there's a sister site called E926 to share SFW content. E926 is yet another food additive (Chlorine Dioxide) which is used to bleach food for a cleaner appearance.)

[sdflhasjd]

E621 - Monosodium glutamate (MSG), Flavour enhancer.