This is how I know them

As far as my knowledge goes, they come in 4 varieties. The nomenclature below is based on my limited experience and your divisions might differ, but however you name it, the characteristics have a very large probability of staying the same.

Men as I know them can be classified as the Ps, Ss, Rs and the others.

P - Promising, Polite and Patient.

These are the loving ones. The ones who smother you with their incomparable love. My Ps would change themselves or change their worlds for the woman they love. They lavish gifts on their girl and use all expletives possible to express their love. They call you beautiful though your mirror says otherwise and stare lovingly at you even when there is a parade of nude females around. Most of the times you end up feeling guilty that you are unable to return their love in the same intensity, magnitude or depth. They promise to wait for you for ages and ages and one day they realize that they can't. In the most ancient and despicable fashion, they drop one long mail, message or none of the above and disappear. Now if the ones of this kind leave, they are gone for good, they would never ever come back. You would only be able to think of them with a pang of guilt, wondering what went wrong. Afterall, the man had promised to stay and that's all what you ever wanted! And in the rest of your life, you never stop wondering, "What if he had stayed.."

S - Silly, Sensitive, Stubborn

Now the S are a whole different story altogether. These are the demanding ones. You really have to try hard, harder and hardest to keep them happy. And still you end up being in love with these rascals, for they have the charm and the charisma that none other possess. If you ask me whether they truly love you, I might answer yes, but again, you have to work for it. Never take these ones for granted, you hurt them and they are gone. But again, they would be back, provided you prove your love for them sufficiently well. One trick that works with them is the art of ignoring them. They cannot tolerate it and would come to you begging, asking for penance. But you should know where to stop or they would just realize that you are playing with them and vanish!! Frankly, I am yet to understand this kind. Don't ever expect a commitment from them. Some days, they would be so close to being the perfect one, and then they would not call you for days altogether. Evidently, they know that you are waiting and would hug them and fondle them when they are back, and a simple excuse would take care of all your anger.

R - Rational, Relationship-Oriented, Reliable

I am in love with the R category.These are the ones who would never speak one sugary word, never spend too much on gifts and never say that they would want to tolerate you for one more life. Damn it, sometimes you even doubt their love. But fake an accident, pretend your nose is blocked, sneeze a couple of times over the phone or perhaps hint that someone else has asked you out, and they would be near you, holding your hand and taking care of you or trying to impress you. No matter whether its a bad hair day, or you are in rags or if your sandals are smelly, they would not comment, apparently, they don't comment even if you resemble Merlyn Monroe in a particular outfit. These are the stoic ones who would be happy to spend a lifetime with you, fighting and making up, the one who would build you a mansion, ask atleast for your choice of color when he buys a car and would be proud of you and your achievements.

Added at special request:

D - Dreamer,Dumb,Devilish
These are the ones you must be very careful about. When they come about, you feel that the chemistry is awesome and that no one could be better. But beware of these cowards, these are mamma's boys with a non-existent back bone. The moment the pressure mounts, the dreamer turns devilish, shows you his ugly teeth and hides behind his mother's pallu. And years later, they would regret and come back ,not because they want to be back wit you, but because they just realize that they should not have lost you. Having them around would never do any good, a smile would make them demand daily SMS and the demand just builds up until you kick the devil out of your life once and forever!

The others.

The rest don't follow a pattern, most of them are 'lets have some fun' kind, some are 'I would die for you' kind and many are 'lets spend a day or a night together' kind. Ignore them, for they mean no good!

If in the course of life, I happen to find another category to add to, be assured that the list would grow. :)