Irony In The "New World"

I think it's pretty ironic how the book is pretty much promoting them to have sex. But in the real world, they advertise it, but they don't want people going out everyday and sleeping around with different people. They advertise to stay with that one special person. But in the book, they are persuaded to have sex with anyone, everyone, whenever and wherever they want. The women have a belt that acts as what we call "Birth Control" that they use before sex. They do the exact opposite of things we do as far as sex, drugs, and the birth cycle.