Unwanted group messages
Why am I getting these 20 people group messages from time to time about sex and other dirty stuff, I always delete the conversation but it keeps coming back saying something different each time, how do I stop this from happening, its the same for my family and friends to, we all get the same thing at the same time, why, how do I stop this for me and other people. I get these messages on imessages on my iPhone, I don’t know about every one else.
iPhone XS, iOS 14