Is it normal to shove guinea pigs into my rectum at a high velocity?

Am I the only one? I've been doing this since Jan of 2007, and I love the trickle of their hair when going up my poop shoot. I cut their nails beforehand though, for obvious reasons. But seriously, is this normal? Is it wrong? What are you thoughts? Should I try pineapples or broken glass next? This is legitimate.