Not having a beard I must disagree. It is all about technique. I start licking and kissing the buttocks and then work the tongue around, teasing the hole. Generally I then see the butthole slowly opening itself up. I slowly start my tongue going inside deeper and deeper, which opens it even more. The larger it gets the deeper I go. This action makes the area all wet allowing me to more easily fuck it with my tongue. Then at some point I use my fingers to pull the butthole apart so that my tongue can go deeper and make the fucking quicker. Many times the guy will raise his ass and pull his cheeks apart on his own. When the hole is nice and wet, I will alternate tongue fucking and thumb/fingerfucking. If my tongue gets really tired I can raise a guy's ass so that his cock is accessible and do some sucking on it. Then go back and work on his hole. Or, as someone mentioned above, you can work on his crack with your chin and lips until your tongue has gained the strength to fuck some more. I have never had anyone refuse a crack fuck because I did not have a beard. And, of course, you can alternate all of the above.