Snakes and Snails and Puppy Dog Tails

Everything you need to know about Men may be learned from classic literature. 
As it happens, there's not much to know...

I married him because I thought he was a gentleman," she said finally. "I thought he knew something about breeding, but he wasn’t fit to lick my shoe. (Chapter 2) 
The Great Gatsby, F. Scott Fitzgerald

Men become old, but they never become good.
Lady Windermere's Fan, Oscar Wilde 

I don't like compliments, and I don't see why a man should think he is pleasing a woman enormously when he says to her a whole heap of things that he doesn't mean.
Lady Windermere's Fan, Oscar Wilde 

A man who does not think for himself does not think at all.
Oscar Wilde

A woman impudent and mannish grown is not more loathed than an effeminate man in time of action.

Troilus and Cressida (Act III, scene 3)

William Shakespeare

Art thou a man? Thy form cries out thou art:

Thy tears are womanish; thy wild acts denote

The unreasonable fury of a beast:

Unseemly woman in a seeming man!

Or ill-beseeming beast in seeming both!

Romeo and Juliet (Act III, scene 3)

William Shakespeare

Sigh no more, ladies, sigh no more,
Men were deceivers ever,-
One foot in sea and one on shore,
To one thing constant never.

Much Ado About Nothing (Act II, scene 3)

William Shakespeare

Well, I will find you twenty lascivious turtles ere one chaste man.
The Merry Wives of Windsor, William Shakespeare 

The true man wants two things: danger and play. For that reason he wants woman, since she is the most dangerous plaything.  
Thus Spoke Zarathustra, Friedrich Nietzsche 

When a man is in love he endures more than at other times; he submits to everything.
The Anarchist, Friedrich Nietzsche

Women speak because they wish to speak, whereas a man speaks only when driven to speech by something outside himself - like, for instance, he can't find any clean socks

The Snake Has All the Lines, Jean Kerr

It takes a woman twenty years to make a man of her son, and another woman twenty minutes to make a fool of him.

A Guide to Men, Helen Rowland

Men are from Mars, Women are from Venus

John Grey

How can a man marry wisely in his twenties?  The girl he's going to wind up wanting hasn't even been born.   
The Neurotic's Notebook, Mignon McLaughlin