Advice from the secular world. What do you all think? How should I explain why these are so wrong for my son when it's time? Should I begin with, "Girls are human too, respect them" or should I say, "Love is more than just physical attraction"?

Advice from the secular world. What do you all think? How should I explain why these are so wrong for my son when it's time? Should I begin with, "Girls are human too, respect them" or should I say, "Love is more than just physical attraction"?