@Bunnyfuller I'm astonished at your attacks on me. You're right, we don't have childblockers on our computers / their phones any more. I don't see the point. They are subjected to it anyway at school, and are clever enough to get around it if they really want to. We do have good relationships with them, and I believe that they are as open with us as any child is to their parents. I also insist on having every password, computers are in the living room, and no phones in bedrooms overnight. We cannot control them, we just have to bring them up the best we can and give them the tools to exist in the world, and the knowledge that we are absolutely there for them to talk things over and help out no matter what.
I actually do not google teachers. I don't know why you think I do. All the children have though, and this is my concern.
I have not engaged in any whispering campaign, nor would I. I have not published the coach's name. I have asked one mumsnetter who has experience in this issue to take a quick look, and she shares my concerns and has given me advice on what she would do. I have listened to the other more general advice.
I strongly believe that people have a right to a private life. I don't think soliciting on social media in such a way that literally the top result on your name on google (with the safe search ON) is one click away from a page where you talk particularly graphic about what are pretty extreme sex acts is keeping things private.
I am not going to go to the coach directly because my relationship is not with the coach, but with the club. It would be grossly inappropriate for me to approach the coach.
I knew that the girls were being coached by a transwoman, but I only became concerned when I learned the girls were unhappy and that the extreme porn is circulating around the children. I am not "filling my boots" with anything. It's all very upsetting, and I wish I did not have to have some unpleasant conversations this weekend.
Unacceptable behaviour is unacceptable no matter who is doing it. I am sorry if transpeople face unpleasantness or unfair discrimination. But that doesn't give a free pass for anything they do.