I think he is saying that teens are boinking more now than they did in the 50's but the lower teen pregnancy is because they are being responsible. That the boinking is what he finds objectionable and wants to return to the oppression that he imagines existed in the 50's.
I don't know if this is true, and even if it is I think it is good that teens are being more responsible and we should encourage that.
And if
@Twilight Hue objects to my characterization of his viewpoint, he can explain it for himself.