Not everyone can. In fact, very few can if my experience with others is any indication.
Main focus while practicing- keep your ass gaped as wide as you can. You should be able to relax your hole enough to show plenty red meat. After that, your guts can begin to prolapse. But that *cannot* if your ring is tight, tight, tight.
Hope this helps

FWIW, I find that to get a good rosebud, I have to 'push' out the prolapse, then tense the spincter around the protruding rose.  It tok some practice to tense the outside ring without tensing the internal muscles that 'retract' the rectum. 
Things that I find help are relaxing, especially the inside muscles, and massaging/rubbing whatever insides are out of/at/near the hole when you push.  Over time, it seems that working right around the inside of the hole and popping things out (like punch, but on the way out) both help.
If anyone is interested, I could post a couple pics to show what I mean.

You asked for it!   
Pictures showing some of what I described can be found at this post, in my picture thread.
Hope that helps, These pictures are the best I have taken, but by no means the best prolapse I have had.  I lack privacy, and the camera and the shower don't play nicely together.