why dont you just using porn to enjoy it once in a while? i mean rather than getting frustrated each day, you can just use porn to direct that frustration. Maybe your wife will understand? it's not like she's your girlfried, but wife. So just as she was disregarding your feeling, you could disregard her too. as long as you dont cheat on her, it would be good.
dont take my advice seriously though, just my 2cent