I don't think those two are connected. Yes, we have access to directly sexual targeted imagery , so there's no need to cram it into everything else. That's good.
But that's not related to today's super specific and fluid sexual identities. People aren't sampling the gullt buffet of sexuality and making their precise choice of their perfect blend. They are making guesses, guessing more wildly now that they have more than 2 options to pick from, and now that it's not taboo to explore, so teens being teens, who are constantly searching for an identity, now can include sexuality in that search.
But that's not related to today's super specific and fluid sexual identities. People aren't sampling the gullt buffet of sexuality and making their precise choice of their perfect blend. They are making guesses, guessing more wildly now that they have more than 2 options to pick from, and now that it's not taboo to explore, so teens being teens, who are constantly searching for an identity, now can include sexuality in that search.