My hypothesis is just that they don't want to legalize selling pornography to teenagers, because teenagers are so horny that they'd become a big market for porn

My hypothesis is just that they don't want to legalize selling pornography to teenagers, because teenagers are so horny that they'd become a big market for porn (sort of like they're a big market for casual-mobile gacha games) and then pornographers would start making porn targeted at teenagers. Which, uh.