The testicles

A patient goes to the doctor :
Patient : "I have a big problem, doc"
Doctor : "Tell me about it.."
Patient : "My problem is that i have two rather unusual testicles : a wooden and an iron one. They have become the reason that i constantly face problems with my wife and my two kids"
Doctor rather surprised: "What?? You have an iron ball and a wooden ball and.. and you have kids???"
Patient : " Errrr.. yes"
Doctor : "..and how old are your kids?"
Patient : "Pinokio is six and Robocop is 25"