What if Scarlett Johansson in the future (say 2066) took anti-age serum to become young again, and then went back in time to the present-day's past to like 1973 and using present-future technology she was able to become Arnold Schwarzenegger. But get this, she doesn't look like arnold Schwarzenegger in any way, or talk like him. Other than appearance, the timeline is kept perfectly intact. "Arnold" stars in the same movies, says the same lines, becomes governor, etc, except "Arnold" looks and talks exactly like Scarlett Johannson, because "Arnold" IS Scarlett Johannson. This means that despite Arnold being a ~30 year old cute petite woman, you still think of Arnold the exact same way you do now, as a huge strong bodybuilder 80's action hero.
Okay, so that's the scenario. But let's say someone tells you that Arnold is really Scarlett, and this snaps you out of it and you realize this is the truth. You realize that the human you thought was a huge powerful man for your entire life is suddenly an extremely sexy woman. But everyone else still sees her the exact same way that we see Arnold today. Assuming you are attracted to women, and that you're attracted to Scarlett Johannson right now, would you be attracted to ex-Arnold-Schwarzenegger Scarlett?