All this is kind of academic, though.
The actual historical reasons that the sexual uptightness of religious conservatives with European ancestry (the WTS's ideological forebears) got so entrenched are because...
a) ...constant indiscriminate boning naturally created a constant influx of illegitimate children, which, in turn, created constant lineage- and inheritance-related headaches, and...
b) ...syphilis had actually become a major problem (think the AIDS pandemic in the 80s, but lasting centuries because Medieval medicine).
Don't believe me? Look it up.
Entire fashion trends were designed around concealing signs of past or present infection.