Never! I've been with my OH for 15 years and he has never done it (only by accident when laughing or asleep). He's toilet trained as well - he thinks women are the messy one's!!
We've been married 40 years and apart from the odd 'accident ' we've never 'parped' in front of each other.
Never heard either of my parents do it either.
A dutch oven: where one person in a bed 'pips' (for full effect it should be so much more than a 'pip'... more a curry fueled 'paaaarrrrrrp')... then lifts the duvet quickly over the head of their bed partner... forcing toxic inhalation pmsl...
If I'm in company when I have to be polite like work or meetings etc then I never do but if I'm out having a fag it's acceptable. I don't mind doing it in front of significant others and even did a few trouser trumpets infront of my ex's mum, I'd only been with her for a few weeks too and she even found it funny and later even reciprocated!!! Dutch oven's are a no no though, I always point my arse the other way or if I drop one accidently I fold my arms over the top end of the covers so it has to escape out the bottom or be absorbed into the fibres of the bed.
Oops!!! My answer disappeared - gone with the wind, so to speak! Anyway, that almost had me on the floor with laughing.
When The Husband has wind, he tends to ignore it, and if me and the children burst out laughing, we get a certain "look", which makes it even funnier. I don't know why people laugh at such a natural function, but we do, and if it doesn't come out from down below, then it has to escape from upstairs.
Word of advice: never let rip when you are enjoying a 69, most off putting for the other partner. esp if there is a misjudgement and a follow-through occurs.
Nothing worse than a fresh havana across your forehead