go buy some fenugreek and zinc for like 10 dollars, drink bucket loads of water and gatorade, And Mast**bate like 10 times a day.
You can laugh all you want, but nothing will kick those nuts back into full gear like pressuring them to continuously produce sperm.
Good luck bro. and remember to work out you non dominant wrist or you will look like a lopsided fool after a week!! LOL