We all have our little weird things that might help making you cum faster and more intense, just some extra stimulation like touching your nipples, talking dirty, looking eachother in the eyes, that kind of things. This dude likes it more dirty, well in fact its disgusting. While riding his dick she starts to shit and puts a big turd on the floor, at the same moment he cums. What would have been the trigger, the smell or the warmth?