Should I or should I not?

People say that when you are married you should not cheat, why?? If i guy cheat it is accepted and the woman should should forgive him, but if a woman cheat then she is a slut or whore. I have been married for a year now and i am still attracted to other men. sometimes, i think i got married too soon and for the worng reasons. I love my husband but i am not sexually attracted to him. When i first met him, i was never really interested in him but everyone said that love will come when you get to know them. Don't get me wrong, I love him for the person he is, and the way he treats me but i just don't find him sexually attractive, so it is hard for me to get intimate with him. I am trying to make it work because i think that i can never find anyone who can love or treat me he way he does. I am so confused.....