I agree with MotownJohnny, it is being a father and loving husband. It's the only real way you get to express being a man, because that is what men do. But, there is more to that, when you do these things, you also take the role of teacher and leader, because you take responsibility for someone who is not as strong as you are, who depends on you. But, I don't think I'll ever be those things, so although I am a man, I still don't know what it's like to be a "complete" man. With me being diagnosed at 24 with autism disorder and depression, and watching my whole life my parents dysfunctional marriage, and being invalidated my entire life by older men in my life, because "kids of today did not do compulsory military service like we did and are thus not real men", also a lifetime of bullying, I'm pretty much sure I'll never get married or have children, because I find it impossible to make the right connections with a girl and have a good loving relationship.