'Fanny farts' haha ๐Ÿ˜ถ

So recently when i've been having sex with my boyfriend, once we're done my vagina does the fart thing bahahaha! The first time it happened, me and my boyfriend couldn't stop laughing but it was still so awkward and embarrassing!! Now it happens after every time. it's never happened before, just randomly started.ย 
Why does this happen and how can I stop it? ๐Ÿ˜‚