My husband and I are both active and committed members of the Church of Jesus Christ of Latter-Day Saints (Mormons). Our marriage has also been impacted by my husbands struggles with same sex attraction and gay pornography.  We have been married for 21 years, are in our mid 60's and now enjoy a loving and caring (but not passionate) marriage. He is happy - we are happy and are both looking towards an eternity together.   I can honestly say that had I known when we were dating that he harbored attraction towards men I probably would not have accepted his proposal.  But today I can not imagine a life without him. So in that regard I am thankful that I did not find out until I discovered gay pron years later. And we had some very difficult patches in our marriage.  There were times when I cried in the shower more nights than not.  But through working with the Church leaders and counselors the problems with pornography addiction are in the past.  My husband is vigilant in not acting on same sex feelings.  Fidelity in marriage means he would not act on or harbor feelings of attraction to anyone other than his spouse.  We worked it out - it can be done- but that may or may not be the correct answer for you.    Continue to seek comfort through prayer and seek out the Lord's comfort and peace with your decisions
You and your husband might find it helpful to reference the materials on the official church website look under "living life" link at the top of the page and then "life help" and look at articles pertaining to both same sex attraction and pornography.  The church discourages all forms of pornography and provides help and support in overcoming that and other types of addiction. 
I think a key here in hope for an eternal marriage is to determine  if your husband is willing to abandon the websites and the pornography. There are addiction recovery materials and support groups sponsored by the Church to help overcome the problems with pornography. No spouse in any marriage should be involved in pornography of any kind, frequenting dating websites, or establishing "online" dating like relationships. These are all types of infidelity in the marriage.  If effort is made to discontinue these practices then it will be easier for him to seek divine help in healing from early life abuses. 
Your marriage, should you choose to remain married,  would be stronger and you will be happier when you focus on the many ways that love and devotion can be expressed. There is far more to intimacy than sex and procreation-- and far too many people have casual sex with no intimacy.  Yes it would be ideal to have both but there are sacrifices in every relationship and perhaps through marital counseling you can determine what is best in your relationship. 
 
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