Usually "daddy material" doesn't refer to his ability to sire children, but rather questions whether he stick around and be a good dad once the children are born. In the example, the woman appears to have been dating a man for a year, which should be enough time for her to find out how he feels about children. Does he look admiringly and longingly at parents with children when he's out shopping, and comment to his girlfriend, "Someday that'll be us"? Or does he cringe when he sees youngsters and ask to be seated far away from them in restaurants?
