yemaya
In my personal opinion I would say that yes it would damage his sperm....but not for ever....
I would get him to start a series of detox method and liver support...
A great place to start would be a series of infared sauna treatments and a bowel and liver cleanse.... I would also have him take a greens drink daily(like greens+) and 100 mg of coQ10 daily, as well as zinc(50mg) a good B complex(50mg) and powdered Vitamin C 2 times a day 2000mg a day. Make sure he is eliminating well...if not add some magnesium to the plan 400mg before bed...it will help him to relax as well....