I know that farting infront of your man is rude...After is it okay to quief?

I'm 14 and new to all of this and don't know the unspoken rules...It sounds very gross but has to come out. How would I silence it? A fart is not his fault and I know I should hide the sound and smell. A quief is his fault because he jams that big, hard, veiny thing in and out of me and pushes all that air inside my l walls.