It is the case that children of fourteen send each other dick pics, apparently not aware that whilst wrong, and even illegal, it may also have consequences well beyond a smacked wrist for them: being on the sexual offenders' register may for instance mean that they are debarred from a profession they had hoped to follow.
We are saying that it is sad, not that we think it is fine.
I am sure that your children know that sending dick pics is wrong, Quaagars. Whether that will stop them doing it is quite another matter; some parents' miserable statements about their erring children are heart-rending, along the lines of "I always told him/her..." And the knowledge that Mother thought it was wrong really doesn't stop children from ignoring parental advice: never has, never will. they try drink, and drugs, and sex, and all sorts of things they have been told not to: testing the boundaries and ignoring what parents say is part of growing up.
If you think that you know everything your children get up to when they are not actually in your presence, I fear you may at some point have to face the unhappy realisation that you have been mistaken.
(I mean, come on: did you really follow every dictum of your parents'? Really? all of them? I don't believe it, but maybe you think it is true.)