
For the vagina, not the anus
Read this
https://www.self.com/story/7-ways-not-to-use-food-during-sex

A part of the article "Even well-washed fruits and vegetables have bacteria,” says Abdur-Rahman. Although your GI tract often handles this bacteria just fine, your vagina isn’t used to it, which can lead to an infection. If you’re set on trying this out, Abdur-Rahman recommends putting a condom or latex glove around the food in question".

As the article mentioned what you put in must be able to be put out. But the anus can withstand bacteria and a lot of things (of course you must clean yourself very thorough). It handles excrement! The vagina on the other hand is very sensitive with its own pH and substances even for a little time can damage its balance.
I'm trying to enjoy this but all I can think is "DON'T PUT FOOD UP YOUR BUTT!"