he's trying to think about someone else.
No it's called concentration, hi's so in the moment he's loving you so much talking would spoil it
depending on what's being said............talking can make it even better
Talking is a distraction that takes away from what he is trying to enjoy. When he closes his eyes he is focusing in on his enjoyment. Tell your wife that if she isn't into sex to let you at least get into it the best you can.
One thing, are you doing enough foreplay to get her to relax and enjoy the moment. Consentrate on her pleasure before you start. They also say that if you can make compliments during the day that she will be ready when you are to close her eyes and be quiet.