Is it nornal to prefer porn to sex with wife?

My husband and I have not had sex for a long time---whenever I bring it up, he makes excuses (lame ones at that). A few months ago I discovered my hubby has quite the appetite for porn. His favorite is lesbian porn. He also likes very young lesbian porn. I found Barely Legal porn mags in the attic as well. Once curious, I was on a mission to find out what else he had been up to. He has a business computer so I do not have much access to it. The few times I did get to take a peek, I noticed he also loves to check out escort sites which makes me suspicious that he is using hookers. I confronted him and told him his porn addiction has ruined our relationship and he promised to stop and work on our relationship> YEAH RITE! I found that he is back at looking at the porn and escort sites and I am about to tell him to take a hike. I have been loyal and gone without sex for a VERY LONG time---too embarrassed to say how long. I cannot find definite evidence of the escort stuff but I did see an email he wrote to a friend. The friend went on a trip to Costa Rica and apparently sought out the services of a lady of the evening....he told my hubby that she was not very attractive and he had to buy drinks and such before the encounter. My hubby's reply-----you can get a 10 in Dallas-$300 for an hour---no drinks, no nothing. Sounds like the voice of experience to me. By the way---I am not a troll so don't go there if you offer advice, suggestions, etc.