Can a man really stay faithful to one woman?

So is it possible for a man to stay faithful in a relationship, no matter how much in love with her he is. In this day and age, with all the beautiful women about, the technology they have, can one man really just be with her with temptation being thrown his way all the time? I think its easier for a woman to give her all and be with someone that makes her happy without cheating, so why do men do it?