The Shakers didn’t have sex?
Hmmm. No STD’s, no out of wedlock pregnancies.
No in-wedlock pregnancies!
No children.
Extinction.
Our culture goes to the opposite extreme: sex for everybody, sex with anybody, sex with multiple partners, permanent monogamous sex, serial monogamous sex, sex for no reason, sex for any reason. Marriage not all that important. Lots of STD’s floating around. Between the STD’s and the lack of children, extinction is also possible.