A married woman will only cheat if she is not getting the attention she needs at home... women do not do it purely for the physical side of it like men do (sorry guys but how many times have we heard "it was only sex - it did not mean anything" ) when you are trying to get back in your wives good books.

Its a normal reaction that if you do not get what you want you will look for it somewhere else... I am in no way defending it and i agree with Qataria that if your not happy then get out of the marriage...