A similar topic explored in the 2009 small movie Moon w/ Sam Rockwell (and Kevin Spacey as the robot voice). The main character doing labor on the moon figures out he is one of dozens of clones, and the original guy living his happy life back on earth. If you could clone yourself and have the clone take your burdens so your life was easier, is that a fair use of your own body and mind to do so? Clearly the jump to our children says “no”.