"Cheating" is a betrayal of trust.
Sounds like you dont want to hurt your relationship and betray her trust or you wouldnt be here looking for feedback.
There is alot of variables about yourself, your wife and your relationship:
If you go behind her back and get caught, is it worth hurting your relationship?
How long have you been together, and is repression of your desires leading to unhappiness that will enevitably hurt the relationship?
Do you have a satisfactory sex life with your wife?
Are you sexually attracted to your wife?
Do you watch alot of porn and jerk off? (Stop, this is feeding your urges imo)
Have you had satifying and fulfling sexual experiences before meeting your wife?
If no, is it something you feel you missed out on that you cant let go?
If yes, is it something you need to re-live?
What is your wifes attitudes about sex?
how secure is your wife around other women?
Does your wife love you back unconditionally and does she know how much you value the relationship?
There is a difference between love, sex and relationships. All three can be together or just one or two of them. Relationship is about compatibility. You can love someone but not be compatible and vice versa.
if you have a great relationship and have great sex, then maybe live with the knowledge that you are "sacrificing" lust for something much greater.
Otherwise live with consequences of going behind her back or being open with her if it turns the relationship sour.
If bringing up the topic on its own is going to hurt the relationship, then maybe its better you go behind her back and live with the guilt.
Without knowing all the nuances, i will say the best thing is to be open and honest about what you want, how you feel about her and the relationship and let the chips fall where they may.