I don't sniff my armpits because they've never smelled in my life.

I have a genetic defect where I don't produce apocrine sweat (the kind that causes bacteria to produce odor) but still maintain the eccrine sweat that cools me down.

This trait is associated with dry earwax.

I've worn a shirt for a week straight and had a relative with a sensitive nose smell it and another shirt that had not been worn a day. They incorrectly guessed which shirt I had worn and which one I hadn't.