Hey it is natural behavior! When laying side by side, just insure it is outbound not inbound. Hell, if they are a sound sleeper they may not even notice if it isn't too loud or stink too bad, of course that can be a challenge.
OMG Bruce...I can actually picture you doing this. You do know most women hear everything their partner does in bed? We just choose to ignore certain things...like farts. Unless you do it a lot...then this woman would shove your ass out of bed.
I'm just sayin...yuck!