Ageist fallacies.

Children (and teens) can tell if they are being used or not. If given the proper tools. When parents hide anything and everything about boys and sex from their daughters they are incredibly ill equip to handle much of anything. When parents promote tough guy strong man ideals to their sons, they grow up with idiotic views on girls and relationships.

You can't prevent people from making mistakes anyway. It only prolongs them. Don't be fooled into thinking the average adult is "mature" enough to handle sex. The total opposite is true. The criteria we give children and teens for dating and sex is so high most adults can't even meet it.