Quote From: promisingI recently found disgusting pornography on my boyfriend’s computer (I mean REALLY disgusting, completely disturbing.) I know it is only "normal" for men to take delight in porn, but I feel like I’m responsible for his obvious dissatisfaction in bed. Feeling this way makes me want to become what he desires, which means I must give up the morals I maintain as a "civilized love maker." I cannot put this past me and I think its beginning to take its toll on my sanity. Please someone help me! 
No it is not normal. It may be frequent but it is not normal. You might want to try to get him to look at it this way: what if one of these girls were his daughter or sister (unfortunately) ? what would he think ? would it be OK for his daughter or sister to be the object of such material ?
He has no moral boundaries for himself as a man. He seems to have limited self control. If this is what you want as a father for your children then this is ok. As far as I am concerned it is a simple straightforward deal breaker. My partner is not interested in this at all. He has other interests that keep him busy. This has nothing to do with you.
You need to maintain your personal integrity and require your partner to support, respect and protect your integrity. Then move on for your own sanity and self respect.
Hope this helps. All the best and chin up !