Realpat, I've had that same problem too when bottoming. I was bottoming for a guy who was 8.5" long, and if he tried to push in all the way, he would hit that same "wall" you speak of, and I would get discomfort and sometimes pain. There is no magic cure, but there is an inner sphincter inside our rectums. That is most likely the "wall," and learning how to relax that inner sphincter as we must learn to relax the outter one is the key. We have to get that inner sphincter accustomed to the feeling of something pushing it open a bit. It won't happen overnight. It takes practice, patience, concentration, and most importantly RELAXATION. Just don't give up because it is possible to learn how to relax that inner spincter to stop the pain you are experiencing. Rome wasn't built in a day! Just hang in there and keep trying.
P.S. Don't worry about giving yourself an enema before every anal sex session. Too many enemas are not healthy for you, and they are by and large unnecessary. As long as you haven't recently had a bowel movement and you know you're empty in there, just relax and go with the moment. And if there should be a little speck or bit of something, that's just simply the price we pay for using an asshole as a fuck orifice. It's natural and nothing a little soap and water can't cure in an instant. Don't get so hung up on those enemas or you're going to kill the spontaneity of the moment AND be in a less relaxed mood which is crucial.
