Ultimately it all comes down to "why isn't there just an on/off for explicit content"?
Mark images as not suitable for children, filter words and allow an on/off function so people can swear without circumventing the blanket filters.
Virtually every MMO on the market has this exact same system. If people violate these rules, report them, let a GM suspend their account. But don't start doing that until you give people an option to turn off the filter so they can swear and stop feeling a need to circumvent these things.