They tell us men not to fart in their presence, so they also try to abide by their own rules. When they feel a fart building up, they tend to hold it in. What they don't realize, is when they prevent these noxious fumes from escaping, it actually goes back in and soaks up more stench from their bowels. What is released then, is something that is 10 times more putrid than their initial fart would ever be; a "super toot" if you will.
I now insist my wife just lets is fly. If you spot your women looking really tense and uncomfortable it might not be you this time; tell them to let it fly.
Just a side thought, I wonder if anyone has made any attempt to bottle and sell girl farts. The methane concentrations could provide a good means to supplying energy.