Men or women, the same rules apply. Shy ones may get left out, because in this world of hurry and scurry few may stop to find out about them. Sometimes, the shyness may be due to some inhibition, some sad childhood fact that may have harshly curbed their natural inquisitiveness or may be just nature. I have known shy men, when befriended, open up like most beautiful butterflies (though you do not use such comparisons for men). I have met some shy men, to later find out they are also the most confident men I have met. I don't think when liking someone, shyness is a factor for or against that, unless shyness is like a impenetrable Armour around the man.