This is throw-back from the Puritanical days when rituals and physics were whatever the god-communicator-person said it was. I would refer you to Galileo's loving discourse with the Catholic church. I don't mean to criticize the Catholic church, but when I was a kid, I could not, for the life of me, figure out why "holy water" was holy. Was there something chemically different about the water after some priest waved his hand above it and recited Latin gibberish that only god understood?
Sex is evil only because the god-people say it is. It's hard to say WHY they say it is evil. I don't know nor do I care much what they think. Until they come at me with axes or machine guns because I don't genuflect in front of some ceramic idol of their "Virgin Mary". Then I run like hell.
The dolls in this sex shop must not look like..... well, they don't want people to "like" little girls. It doesn't matter that millions of people do (yeah, there's millions of us!) But declaring us to be evil grants them permission from the god-people to hurt or kill non-god-people. They feel justified and heroic.
So, for them, the sun goes around the earth and Galileo was forced to agree... publicly.