TIL that if you have a Brazil nut allergy, you can develop an allergic reaction if you have sex with someone who had recently consumed Brazil nuts. A study in 2007 documented the first case of a sexually transmitted allergic reaction to Brazil nuts.

https://pubmed.ncbi.nlm.nih.gov/17583107/

https://www.reddit.com/r/todayilearned/comments/15rt917/til_that_if_you_have_a_brazil_nut_allergy_you_can/