Dang, I was actually observing this the other day (while rock climbing outside in Texas). The guide smelled like.. you could obviously tell he didn't wear deodorant, but wasn't bad. Just like regular sweat, until the end of the day when it was approaching "ok you need a shower". I smelled pretty much the same only with women's deodorant (which doesn't do shit for our heat). My SO smelled like sweat and his shower gel, and the other guy smelled like nothing. Had we been fat... well, that would be disgusting.