LivingThe Dream - "How could it be Paradise without sex?"
Authoritarians have always - always - been very uncomfortable with sex, for several reasons;
1. It interferes with the process of empire-building; if the masses feel relatively content and fulfilled (which a healthy, active sex life hugely contributes to, no matter what anybody says), they will be far less inclined to participate. Authoritarian leaderships have, historically, (more often than not) looked for ways to discourage sexuality in order to redirect their followers' energies towards advancing the leaderships' agenda; militarism, for example.
2. (related to 1.) In the case of high-control groups, it interferes with the process of recruitment; recruitment is much faster and easier than raising and nurturing a human being from infancy to adulthood and reinforcing the leadership's ideology along the way.
3. Some authoritarian leaders were themselves quite socially inept in their formative years; this often, in fact, would reinforce their authoritarianism. Socially inept individuals – especially when they're men – have a much harder time finding prospective sexual partners over the course of their lives. If and when these ones attain leadership positions, and if they are religiously conservative, they often feel compelled to curtail the sexual activities of their followers; after all, if they couldn't get some, why should anyone else? I'm sure this sentiment would hold true for socially inept authoritarian followers, as well.
There are other reasons, but these are the big ones, IMO.
As far as Old Man Jaracz was concerned, for example, a world without sex probably would be a Paradise.