maybe the user Mike50 just isn't into it. My first experience was when I was very young and tried silly things like a pencil or pen, and stepped up to a small carrot/etc. The reason I tried these things is because I was interested, and I didn't jump the gun into it.
If you are a top and like being a top, just "let it be" if you don't enjoy receiving anal. Everybody is different, and nothing should dictate your personal desires in your sex life.