carla: "AND NO, Christian churches do not have these discussions around children"
BINGO! I've spent nearly 50 years in mainstream Christian churches* and I don't ever recall explicit and graphic detail of sexual acts being mentioned from the pulpit. And remember, most kids leave the main service halfway through to go to Sunday School or Kids' Church**, where they receive age appropriate teaching and craft activities.
* Anglican, Presbyterian, Baptist, Independent Fundamentalist Baptist, Open Brethren, Uniting Church, Church of Christ, Various Pentecostal denominations. Even non-mainstream sects I've attended, like Christadelphians and SDA never aired that sort of thing in front of kids. JWs seem to be unique in this regard.
** In my experience, most of those featured teachers who were thoroughly vetted and supervised.