Besides being oppressive for its victims, the “new” morality (which, as the author points out, is neither new nor moral) focuses attention entirely on the carnal. Whatever can be present in the act of sex beyond mere libido is cast aside. And that makes the act between humans qualitatively the same as the rut between two animals.
A society so obsessed with bestial pleasures is not one likely to ennoble its future.
Even less than bestial, because the animals are reproducing.