Best ignored is the best answer if in the middle of hot sex act. In reality...FUNNY, FUNNY, FUNNY!
Big-haired Bitch/Personality Hire
It happens. It's actually the dude's fault. One of the main causes of a queef is dick friction. It's not an actual fart. Just air that escapes the vagina...usually during intercourse.
"What is the quality of your intent?" - Thurgood Marshall