That is a very short question...with big implications. I am wondering what exactly you are asking....or implying? I guess I would tell you from your question it seems you are saying that you are having a hard time staying faithful because you don't feel satisfied sexually. You don't want to be unfaithful but are tempted....and wonder what to do? So my answer would be...first of all communication with your partner is huge. You need to be communicating your needs....in a way that lets them know what you want and that you want THEM....making them feel like they are the only one for you but also letting them know you'd like more of .....and you can fill in the blank or you would like to try....and fill in the blank. You both need to talk.
And then there is of course fantasy life. We all have imaginations and can put them to good use... the possibilites there are endless.
Beyond that...withouth knowing more about your situation...why you aren't satisifed...what exactly is making you unhappy or temtped to be unfaithful...and a lot of other things... I can't be more helpful. I'd like to be. So, if you want to message me because you prefer to keep your information more private I would be more than happy to talk with you about this.
~K~
Fantasy, toys, devotion to your spouse, pride (do you want to be someone who has no integrity about promises you make?) Integrity can be a pretty cold bedfellow, but when you resist temptation to cheat, later you feel proud of yourself that you are a person of your word.
That, my friend, is the eternal question!! Good luck! :-)