The chart only goes parabolic in the mid 90s... I blame "Grunge"

Now do gay frogs.

For me, it's individuals longing for attention. Piercings went to an extreme. When an individual no longer stood out in the pierced crowd, body mods began.

Tattoos went from body parts to the face untill that was no longer extreme enough to stand out. The trend to change gender is no different. Stand out from the crowd by changing your sex but as with all trends, they run their course. Piercings can kind of heal over. Tattoos are a more permanent reminder of one's choices but artificially altering hormones, puberty blockers and adding or removing body parts, "that's gonna leave a mark". Mostly in a cry for acceptance and belonging.

In my opinion this is a result of programming. Media, schools, socials...

Stupid impetuous humans.