A: Fruits. Vegetables. Tissue paper. Tiny pieces of cracker. Really anything small and soft and that will decompose and sluice through drains would be fine.
You know what's not good for pipes: chunks of dead hooker. Hundreds of bloody, messy chunks. All that bone and hair, that's gonna ruin your pipes and mess up your plumbing all over the house. But, I don't need to tell you that, you found that one out for yourself.
I don't know which is more appalling, that you murdered all these women, or that you were too lazy to chop them into smaller pieces. Did you really think you could flush an entire leg down the toilet? Or wash a head down the drain in the shower? Are you crazy or something?
Don't answer that question. I don't want to know. I'm here to fix your pipes, not write your biography.