Whats right?

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This is a case of morality and friendship, I have a friend a childhood friend I should say,he was married close to 5 years earlier than me,but he is still not blessed with any issue. I was married just a year back and my wife is expecting baby this spring. Now, my friend and his wife have had a meeting with me, where they both proposed me to try for a baby with my friends wife,as i am his best friend he has asked my help for this, they both love to have a baby.I asked them they should seek some other method between themselves as it does involve an issue of morality between my wife and me.But his insistence is proving a awful push for me. What is the right course?