I tend to agree with John Sherrill's summation: "...being a gentleman means putting the good of others before your own."
However, I also think gentlemanliness is only one facet of being a man; it pertains specifically to how a man interacts with other people, which can be somewhat superficial. While it's great to strive to be a gentleman, we should be careful to remember that this is only one aspect of manliness.
"No argument JB. Just note I said that adult humans don't absolutely need bovine butterfat to survive and thrive. Point being that the only mammal that absolutely needs bovine butterfat to survive is a bovine calf."