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It is, I believe, also somewhat sulphurous.The smell in farts is nothing to do with the methane (methane is pretty odourless, and natural gas, which is also methane, actually has to have a smell added so that people can smell when their is a gas leak). The smell in farts is due to various other additives our digestive system adds to the methane.
<snip>The smell of farts is largely Hydrogen Sulphide <snip>Interestingly, there's nothing in the gases themselves that make them inherently nasty. <snip>