I don't wash jeans that often and i air things which don't get smelly so fast over night, like linen shirts. But my t-shirts or underwear are smelly after one day.
And no, i don't want no aroma on my pants!
Those are the things that should be washed regularly and hot washed. Undies protect the rest of our clothes from all the ick. The hot can degrade the elastic but replacing a band isn't too difficult.