That's the smell of physical labor not the smell of sitting on your ass fumes that is being suggested lol.

EDIT: Also want to point out some cultures use so much perfume that it most definitely does make a difference on what you are wearing, although my nose feels like its getting pepper sprayed whenever I step into a mall with like 30 perfume shops lined up lmao

There's a big difference from fresh sweat and 7 days old sweat.

She likes it when you've been working hard to make her garden nicer... Have you considered it's not the smell doing the work here?

I suspect that it works because she is your wife. BO works a lot better on your 101st date than it does on your 1st date. It is not about your armpits having an alluring scent, but the fact that the scent reminds your wife of times she got you all sweaty and stinky. It calls back to driving home after a long hike or snuggling with you on a cold winter day. It is a scent that she is used to smelling when she is looking at someone she loves.

Your smell. When she's bonded to you and loves you. If it's some random dude you're on a first date with? Ew.

Fresh sweat is sexy, but sweat goes from sexy to funky pretty damn quick. This is because the bad odor isn't caused by the sweat itself but by bacteria in your sweat.

She's already attracted you you and your odor.