www.youtube.com/watch?v=B3zqFJDJf2Q

TL;DW:

• Farts can smell worse in the shower due to being in a closed space with nowhere for the gas to go.
• The main reason for intensified fart smell in the shower is increased humidity.
• Higher humidity enhances the sense of smell, allowing detection of lower concentrations of odors.
• Water vapor may help smell molecules interact with nasal receptors.
• Gas particles can bind to water vapor, allowing the air to hold more smell.
• Hot showers create steamy water vapor, which amplifies fart odors.