I would guess they're using more of a common sense standard than an absolute standard. The Sports Illustrated Swimsuit magazine can be found on any newstand and

I would guess they're using more of a common sense standard than an absolute standard. The Sports Illustrated Swimsuit magazine can be found on any newstand and I don't think it carries any age restrictions (not sure though) and the Karma Sutra is widely stocked in libraries. They are both examples of sexual content that has a broad social mandate to freely exist. There's the issue of quantity of these apps which I think is probably along the lines of a newstand that stocks a few porno magazines is very different from a porno shop.