I'm a bit worried about something that's been happening with my husband. We're both younghe's 32 and I'm 21and we've been married for six months. For the first five months, everything was fine, and he was able to insert his penis into my vagina. But for the past month, he hasn't been able to do that because it doesn't get strong enough. He can still release sperm, but the penis doesn't stay firm enough to insert. What could be causing this, and what should we do?