This isnt a dirty video with poop/scat or something so its safe to watch if ur not into that. Allthough it can happen in any position you have the most change when you fuck a pussy doggystyle. A big cock and a big gaping pussyhole will also help. I personally think its a turn off when it happens, you automatically link it to a real smelly fart and thats something you dont want during a good fuck.