If he was Catholic at one point in his life you could use guilt manipulation to control him.  If this fails break up with his lazy ass and become fuck buddies with your ex. 

If you would prefer some nicer (fru-fru) advice try one of the below resources:

http://www.wikihow.com/Overcome-Laziness
http://www.marathonfamily.com/Default.aspx?tabid=124
http://www.quickiesheets.com/blog/2006/08/22/how-to-stop-being-lazy/