boys seem to be stubborn about going poop in the potty. My oldest boy, who is now 3 1/2 absolutely refused to be consistent with his potty training, and RARELY would poop in the potty. It was so frustrating. In August, I was at my wits end because he was getting ready to start preschool and he needed to be fully potty trained. When we were home, I would have him take his pants off - no pull-up, no underwear, nothing. I figured that he would realize that if he pooped or peed on the floor, that that would be just plain weird. It worked. He would run into the bathroom and do whatever he needed to do. At first, we did small rewards for every time he pooped in the potty. He loved that. We even made a potty poster to put stickers on what he did in the bathroom. He was very proud of himself.
It takes time, and the little ones just need to call the shots with their potty-training. It all works out in the end. Don't give up. My 3 1/2 year old is fully potty-trained now. He actually became potty-trained right before preschool began (perfect timing). He rarely has any accidents!:) It's a frustrating process, though. I certainly do not look forward to going through this again with my youngest son!
Hope this helps!:)