I so understand where you are man... I self designate as straight, married with kids and was abused from about 6 or 7 until 13 or 14.
Often, the draw to porn which is opposite of our self designation is an attempt to numb the pain of the past abuse. It isn't necessarily an indication of our sexual preference. I believe that is a seperate issue for many of us.
Sometimes it is merely an attempt to change the outcome of the abuse..... reliving it trying for a different outcome or an attempt to control past events in the present. Tough stuff...
If you have not read the book Victims No Longer, run, don't walk to download or order it. It will help you to begin to make sense of the impact the abuse has had on you as an adult. It made a world of difference to me. It helps us to connect the dots.
I have not read it yet, but our own Ken Singer has a new book out: Evicting the Perpetrator: A Male Survivor Guide to Recovery From Childhood Sexual Abuse.
Check out our bookstore: http://www.malesurvivor.org/bookstore.html
This isn't a commercial, we need all the help we can get and these two authors know what they are talking about.