When secular laws prevented the Catholic Church from burning people alive, no one ever considered the societal function such behavior served. Now we are suffering from the results.
What makes a desire to be eaten? Simple. I must be ONE with you. I need to unite with you. If I can crawl inside you and lay my eggs my life would be complete. If you eat and devour me? Yeah that works too. I just need to be IN you. I need to wear you as a skin suit.
There was that level from Ocarina of Time where you have to go inside the big Zora fish?
I'm blanking on the specifics, but "flesh levels" in videogames where you're inside something definitely weren't an uncommon sight in back in the day. Any of them could probably fuck some impressionable autist up.