Well, it’s not always the case, is it? Not all men do remarry. I think it’s generalising to say that they do. Perhaps quite a few do, but in my family and circle of friends, for example, none of the men have remarried after losing their wives. Perhaps the age of the bereaved person has a part to play, and how long they were married?
I think there are men (and women), who can’t live alone and need someone else in their lives, but I think there are a lot who can and don’t.