I love to pleasure myself anally as often as possible. There are times where I bleed and poop and have light brown colored phlegm and fart during penetration.
I always try and fully flush myself out a few times hours before hand and wear a plug. The plug helps stretch and stimulate my desire for anal and a good flushing makes for a very clean, enjoyable experience. Yes, after a good anal fucking I experience the "walking farts"...just excess air leaking out with the cum.