Remove penis from
anus during anal intercourse. Make sure that the penis has a
bit of feces on the tip. You may need to go back in deeper to get a sufficient amount of fecal matter on the tip of the penis. Once you have a good amount of fecal matter, you then touch the upper lip of your
partner, making sure not to smear, to get a perfect Hitler style mustache.
You can then enjoy the sight, or you can touch lip to lip to provide yourself with a Sexy Hitler too. That is called a Dueling Hitler.