I've always thought about it if I body swapped, and personally, I always end up with “reality”.
In my current body, I'm a straight guy. But if I get swapped into a woman's body? My reasoning is, “this is my new reality, so live it”.
I went further, what if there's a technology to extend our lives by moving to a new body? We retain our memories and experiences as well. Will I choose a man's body again? Or, will I select a woman's? My choice is always to pick a woman's body and live as one. And if it gives me a good experience, I'll pick it again in the next lifespan.
For me, my decision comes from accepting my reality. If I'm swapped in an extraterrestrial body, then live as one. If in a robot, then live as one.
Ahh! It's the “This is me” scenario. It's similar to LGBTQ, it is their reality so they live it.
So, I think that's what the writer is hoping for in the series. The two characters just accepted their new reality. Life as a woman and live as a man. They both identify as “straight” but the gender is detached from it. They are “straight” is relative to their present body.
At least that's how I see it. ^_^