Instead of a strict straight/bi/gay split, I prefer to think of it as a spectrum where 0 is completely straight, 5 is completely bisexual and 10 is completely gay. I'm guessing it's possible for you to shift yourself a couple of points towards the middle of the spectrum, but not an arbitrary amount. E.g. if you started off at 0 you might shift yourself to 2, or if you started off at 8 you could shift yourself to 6.

By this metric, I started at a zero (unable to find other males sexually attractive,) and ended at a zero. My attempts to influence myself to have a sexual interest in men achieved null results.

I have no problem finding other men attractive, but they're still about as sexually appealing to me as plants.