Paris Sewer Museum, good idea or bad idea for anniversary?

This sounds crazy but I'm visiting Paris for our 25th anniversary and visiting Eiffel Tower on our anniversary and given the location that's the best day and time to visit the Sewer Museum after a picnic lunch on the Champ de Mars.

Is this crazy? Will our clothes have an odor after leaving? Bring me to reality and let me know if this is silly fun or a terrible idea.

Thank you!