The things you find out while randomly browsing the internet! Apparently if someone has a food allergy they can get an allergic reaction after sex if their partner has eaten the thing they are allergic to. Should I find myself in need of this information there's going to be an awkward conversation about mushrooms.

https://blogs.scientificameric...tted-food-allergens/

(Actually I'd be OK because it seems that while a woman can have an allergic reaction to her partner's previous meal, it doesn't work the other way round)