TheOriginalBigBlue
Gold Meritorious Patron
The SO rule was just about the PR "visuals" of "ministers" in a "church" not having sex outside of marriage.
I think LRH didn't like the drama and disruption to production that came with "inter office" dating.
But he didn't like people getting married either. It is more difficult to transfer, censor and command married people than single drones and they require more expense and logistics.
If children could be born already turnkey at a working SO eligible age without all those bothersome expensive non-productive years and made property of the state like in Sparta then he probably would have ordered people to have unmarried sex.