Originally posted by renorenal:
[b]NEW
MYSTERY
I am a family of 5
We are tough, but not that tough
We are located in the smelly region
Of the human anatomy
But we must be treated with respect
We are the main cause for excruciating
And shooting pain for guys
If one of our supporter
Decides to give way that is
If our nerves are sliced up
You will need help
In peeing and pooping
What are we? 
[/b]
Hmmm, no idea what's that. Was thinking of the digestive system.
Now not sure.