Much of this is "what would you expect?
People have throughout history been influenced by religion, societal, cultural etc norms and attitudes to be afraid of, hide, reject and protect from anything which suggests less than 100% heterosexuality.
The history of lesbianism is quite interesting, having had more acceptance, or less revulsion anyway, partly due to the lack of unhygeinic intromittent activity and associated disease transmission.
We are in a period of transition, towards individual freedoms, and rejection of prejudicial attitudes to defined groups. So, overall nothing very surprising or unpredictable is going on.
Difficulties at upper school ages are just a focus for that. Pitch archaic attitudes of parents and some schools with conservative tendencies, against desires of freedom in the kids, at a time when the kids' hormones and parents' control worries are in violent flux, and what would anyone expect?
Whether general acceptance of a continuous spectrum of gender will conspire against stability of relationships, I don't know. What happens If you start off with your partner where you've both been
open about being say only two-thirds sexually attracted, and so therefore less obliged to hide your other-side urges? Would there be more of a temptation to have a go at exercising them for a while? I think it was Woody Allen who mused on whether it was worse that his wife had left him for another
woman.
Perhaps the worst aspect of addressing the subject is that it brings out the jetsam trolls who think it's clever to take the píss, and those who pathetically try to defend some revolting, failed, off-the-shelf morality from indoctrinated religion.
