There are many men that are quiet this is a pretty common thing. In most cases it is not that big a problem. Let him listen and just dont worry what anyone thinks. It does not really matter anyway.

Actually my husband Ken was always quiet too. Now people dont really believe that but he really was. Even my sister when we married said it wont work he is too quiet. Well he has found his way and I think a lot of it has been the socialization on the cruises. He still does not talk as much as me (he cant get a word in lets face it) but he is much more social. However, even those who know him well if they really think about it he has that quiet streak.