> People who are going to commit sex crimes, will do so
I don't think the reason parents want to prevent their chldren seeing naked bodies (and these seems to be where 99% of the pressure is coming from) has nothing to do with crime, exploitation, self-image (probably the most bogus "argument" of them all) or any of the other frequently cited reasons. ISTM the real reason is simply that they feel uncomfortable discussing such "adult" topics with their kids and will go to extreme lengths: including denial, demonising sex and making the inquisitive youngster feel like they are "bad" or "dirty" for asking, simply to avoid the embarrassment they would feel if they had to talk about it, themselves. (Or possibly because they are so ignorant of the subject, they don't wish to be questioned and have their own lack of knowledge revealed.)
If so, then this is exactly the wrong approach as it's just human nature for people to want something more if they are denied it. Or to make them more convinced it's worth finding out about if their parents keep avoiding the subject.