Jack shit.. and boops..
I hear what you guys are talkin bout...
But another thing that always woried me about taking it in the ass is...if it ssore you cant monnitor it that closely as other injection sites to see if it might be an abcess, knot, red, etc....you have to try stupid possitions in the mirror etc.
If one can do ass shots the more power to him in my book...but im a pussy.