I've noticed on several occasions a distinct odor of flatulence while eating girls' pussies. I think they're aware they need to fart but just hold it in and let it leak out.
One of the great myths propagated by women is that they don't fart. But there are lots of cell phone videos proving it ain't true.

Otherwise, never.

It can be hard to take your shot and hold a fart. Last week I let one go, and it was clearly audible. She was in CG at the time and clearly in danger; so I said oops, and rolled her over so she wouldn't catch a nose full. She had no reaction to the event; IDK maybe Japanese chicks can't understand Engrish farts either?