It’s just a fad of declaring one as such and will pass soon. The amount of women actually having sex with women or men having sex with men hasn’t grown much.
The “Q” in the acronym of perversion is the key to bolstering the numbers. It is the catch-all for anything a young person thinks is sexually different, like mere sexual awkwardness in adolescence and early adulthood. Like nearly 100% of people growing up experience.