My husband is a marine and works long hours so I can understand him being tired or worn out every now and then. But he is exhausted all the time even on the weekends. If he doesn't get at least 8 or more hours of sleep he's like a grizzly bear. He has a very low sex drive and knows it just doesn't know why (he is only 21). I have already tried to talk to him about fertility testing but he kind of freaked out. I'm very concerned that he has low testosterone but do not know how to bring it up without hurting his feelings. Help!