Dude, IF YOU LOVE YOUR WIFE, you would KNOW that one NEVER and I mean NEVER goes from the ASS to the vagina (and I know you get caught in the moment). It's ok to go Vagina to ass but NEVER ass to vagtina. That is VERY unsanitary and you can cause her serious problems. WOW! SHe's a keeper but you are not the smartest guy in the world! DO YOUR RESEARCH dude!
Those are NOT farts! It happens with my wise as well. It happens when her ass is big and gaping. Each thrust inside pushes some air inside and than it comes out.