My brother and I have dealt with our abuse a little differently. I don't talk about mine very often. It defines my brother and he is bitter and angry about it (emphasis mine)
The second law of homosexuality:
To the mentally healthy person (heterosexual) sex is something they do
To the mentally diseased ('homosexual') person, sex is everything they are
You've apparently forgiven and gotten over (for the most part) the sexual crime committed against you. Your brother has still not forgiven and is still trapped in the "sex is everything I am" mindset. Until he forgives his attacker he will remain trapped. So he chooses that lifestyle because he is still mentally diseased/damaged.
I learned that once I forgave it became a whole lot easier to get on with a normal life.