Advice for Young Marriage, Dear Bill

I married when i was 18 to a 30 year old woman. The age gap, coupled with her bad p m s, is starting to affect me. So far i have controlled my but i feel like i am fighting a losing battle. What do i do? My wife has seen the conflict within me and sympathizes. She sometimes says that i can have some fun with other women if i tell her first. But i don't know if this is true, or if or is a honey trap. Do i secretly cheat? I have a good opportunity to get away with it? Do i talk to her about some freedom? Or do i knuckle down and masterbate myself into submission