Supposedly, it's the production and excretion of methyl mercaptan (very smelly substance) that's produced during the digestion processes of asparagus. Supposed to be related to a gene that only occurs in 40% of people or so.
More interestingly, anedotal evidence shows that urine after the consumption of asparagus ("sparrow grass", ironically a food popular amongst the poor centuries ago) only started to smell after the introduction of sulphur-rich fertilisers in the 18/19th century.
Great trick is to piss in a crowded trough in the gents' toilets after eating asparagus - people think you have a serious STI.
More interestingly, anedotal evidence shows that urine after the consumption of asparagus ("sparrow grass", ironically a food popular amongst the poor centuries ago) only started to smell after the introduction of sulphur-rich fertilisers in the 18/19th century.
Great trick is to piss in a crowded trough in the gents' toilets after eating asparagus - people think you have a serious STI.



well I get paid for it


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