What does it mean to be a man?

In this day and age, what does it mean to be a man?  Who and what defines what being a man is?  Is it having the biggest pay check? the most toys? getting the most women? having the most fun? Is it none of these?  Is it a combination?  

Is a man’s worth reflected by the family he produces, the deeds he does for others?

Should a man be judged by his intelligence?  His knowledge of politics?  His standing in society?