On Saturday nights, my wife wears bikini bottoms and pisses on to my chest whilst wearing them and then uses them to mop me up. Then she makes me wear them to bed (I put a mattress protector down under me to keep it off the sheets). By the Tuesday morning, I have a constant hardon from the smell. We then fuck with a lot of piss play on the Tuesday night before I go back to wearing my normal undies and then going through the cycle again come Saturday.
The smell is absolutely intoxicating and turns me on like nothing else, particularly as they age a few days.