Hi Hopehere's a medical article you might find interesting:Fertility in Men With Cystic Fibrosis(*): An Update on Current Surgical Practices and Outcomes.Chest, Oct, 2000, by Theresa J. McCallum, Jeff M. Milunsky, Donna L. Cunningham, Doria H. Harris, Thomas A. Mater, Robert D. OatesAn Update on...