I'm with the other guys here-- I wouldn't take these dreams too literally. Many of us either had terrible self-esteem problems before our perps came along, or we had them afterwards. If you felt you were somehow "inferior" to the boys you were having sex with (back then,) your dream may have been more a way of identifying with them instead of actually having sex with them. I've had those, and they're really nothing to worry about.
As to the one-night stand, it's important to look at exactly what it was that drove you to that. The one-night stand could easily have been a "you're in control now" re-enactment of the abuse. If you've always felt like women aren't attracted to you, it can also be (1) a "rush" that someone felt you attractive, (2) a sense of empowerment that you were able to "land that catch," and (3) a no-strings-attached sexual release. In other words, it could be a sexual conquest that occurred in what you believe is the only way open to you. The point is to look at it and see what drives you to it and what need it fulfills.
The gay porn is similar. What is it that makes it attractive? I know that I felt the guys in the movies were way better looking than I was, they had much better bodies, larger things, and so on. The movies were also set in "macho" environments like gyms, barracks, and so on. Often they started as a bunch of guys hanging out, maybe having a beer, before turning sexual-- much like the abuse I went through. (When I discovered how much those guys looked like my perp looked at that age, lots of things fell into place.) Could it be that, for you like myself, simple male bonding was sexualized and equated with having sex, courtesy of your perp? The point is to look at it and see exactly what it is that you're finding attractive. You might find that it's self-esteem issues, envy of really good-looking guys' bodies, and the thrill of the chase. These are NO indicators that you're gay. Not at all!
Would you ever consider leaving your wife for the guy you had a one-night stand with? How about kissing, cuddling, living together as spouses, adopting children, and romance without sex? If the answer is "no," I doubt you're gay. If it was just sex without any sort of intimacy beyond close bodily contact, I'd be likely to attribute it to csa. Just my thoughts-- I'm not a therapist. I'm glad you're here at MS, and I wish you well in healing.
Never worry about "three steps forward and two steps back." Thirty steps forward and twenty back are still ten steps in the right direction.