When having anal sex,you will shoot a full load in the anal cavity. You should then roll your partner over and immediately squat with your asshole over their mouth and as you squeeze off one of the biggest farts you can muster you punch her in the stomach. If done correctly a large cum balloon should shoot out of her asshole, (sperm is first in most cases but not all,often followed by fecal matter)
This maneuver should only be preformed on women of lesser stature than yourself because, larger statured women can become highly agitated and ussually get pissed when you fart in their mouth, much less give them the gut shot

A swimmer