Not read/seen this, but I'm reminded of other sci-fi stuff that visited similar themes. So, Star Trek Next Generation (season 4, episide 23), 'The Host', had Dr Crusher having a relationship with a Trill, which were a symbiotic species. When the symbiont was eventually transplanted into a female host, Dr Crusher declined to continue the relationship. So, from a 1991 perspective, Beverly declining a homosexual relationship, even though from the point of view of personality the individual was similar (blending of symbiont and host personalities, but retains memories). Disappointed as we all were that Dr Bev didn't turn into a dyke, nevertheless the premise (sex matters, bodies matter), wasn't particularly controversial at the time, as I recall. Would have been more controversial if she had had a lesbian relationship, frankly.......
And of course we have Virginia Woolfs Orlando as well. The ideas are not new in terms of personalities/bodies/sexual attraction, but the seemingly only permissable answer nowadays is (the we should not mind the sex at all, just the person).
As regards 'Every Day', from what it says on the web, the premise (a soul that inhabits someone else body every day) sounds potentially exploitative -- if A is in love with the same girl, does the host body get to consent? Have they agreed to host this spirit? Why do we try to assign a 'gender' to the body-hopping spirit?.........SO, in Sci-Fi, from Orlando to Quantum Leap, these ideas are not new in anyway, but the twist being used at the moment is..............to try and convince us that 'gender' matters and sex/bodies don't/shouldn't...........