its a natural bodily function. Not always pleasant, but lighten up a little and have some fun.

Just try to ask her to remove her face from your nether region before you blast one.  It's only good manners.  If you have to go, excuse yourself to use the bathroom, take your crap, re shower and come back, but it's on your dime, not hers.  I try to do my business before I get to an incall, preferably at home, sometimes en route.  Either way, try to shower afterwards, you don't want to stink when you get there if you can help it, for obvious reasons.  Like you said, it's a bodily function and if coming on suddenly, I have been known to actually stand up and walk away from bed and provider before gassing.  Believe me, I have gotten appreciate remarks for it.  If excessively gassy I will sometimes try to reschedule, or call and explain situation if it's one that was a long time in planning.  At that point I let her make the call for cancellation or not.  Either way, going in silent but deadly is the best way for you to get on a gal's DNS list due to hygiene.  Thankfully, I think I have never made one of those lists due to my own precautions.  Just be clean and stink free as possible to have the best time possible.

Try and take a crap before you get intimate, shit/ shower/ shave. You can always change your diet, high fiber with plenty of water, and probiotics help clear out a lot too. If it's a true intestinal bug then please cancel! I would hate to rim an ass that has been having explosive shits that day! I think it is a part of hygiene, however, it can be managed. I make sure I eat light if I have a scheduled date, would hate for my stomach to make loud digestion noises or worse fart while he's DATY or while I am in doggie. But hey we are all human, it happens, just put it down in hobby bloopers.

When you rip one, just turn to Fido and say:  "Bad dog!  No more chili peppers for you."

In any case, I sure am glad that my farts smell like roses.

...and please close the bathroom door.  

Speaking of closing the bathroom door, when you take a shit don't leave the door open!  This is a "girlfriend experience" not the "wife experience.

I gulp about half a bottle a couple hours before the date. Don't eat much.  Always calms down my belly.

From a girl's crotch.  I do not stay, I leave during such an occurrence.  We need to be clean, both of us, to have a good time I think.

I could tell you some stories.  I had a guy that I was performing oral on while his roommate was asleep.   Mr. Sleepyman farted loudly as he was snoring.  Trying to laugh with a dick in your mouth is no fun.  The guy I was with started laughing uncontrollably.  It definitely changed the mood.

Another time, I was doing doubles with another lady.  We both sat next to him in bed and asked what was he into.  A fart slipped out of him.  So I go, "that will be 50 extra."  Everyone started laughing.

Just FYI

Many hotels sell various medicines in the lobby, including GasX.

Saved my ass. Literally.