Sparky,
One should not confuse the Watchtower definition of what Paul is saying with what one finds in the actual text. If you read it like the Witnesses do, of course it sounds idiotic. But it is not because Paul wrote it with the JW understanding. To illustrate...
"Does not nature itself teach you that if a man wears long hair, it is degrading to him…"--1 Corinthians 11.14, NRSV.
The word for “nature” here in the Koine Greek text is PHUSIS. It means in this instance “social order,” as in the Roman social order or way of doing things. It does not mean “nature” as in the sense of a National Geographic television documentary about flora and fauna.
In first century Hellenism and Roman culture, the “natural order” of things had no division between what one witnesses in nature (i.e., plant life, animal life, etc.) and the societal norms, social conventions, and culture of human society. The customs adopted and promoted by humans were believed to be as “natural” as what happened in nature itself. They are one in the same thing in the first century mind.
Therefore to act outside of societal norms was to act “unnaturally.” It is not a scientific term, but one that expresses the ancient Roman understanding of how the world worked.
Paul was not telling the Corinthians that it went against biological norms for men to wear long hair, but that it went against Roman convention. A clue that helps one come to this conclusion even without this knowledge of ancient understanding is that Paul comes from a society where men did let their hair grow long, namely in Jewry. Paul himself even pays for the haircuts of Nazarites at the Second Temple at Acts 21.23, 24, 26.
Obviously he wouldn’t be saying that it was biologically unnatural for men to grow their hair long as he has witnessed it himself as part of an offering of oneself to G-d as a Nazarite. Since Jews would never offer something biologically unnatural to G-d (and Nazarites grow out their hair during their vowed period), Paul would not have been condemning the biological growing of hair in men. No, here he is speaking about convention.