To be honest I don't think it matters, it is as true as you believe and want it to be, think about Dan Brown's Da Vinci Code - many believe that is true and for how many people is the fact that they are in contact with people from outer space. Evolutionists believe there is no god.
We have intellect and personality and chose what we believe in based on up-bringing and experience.
In the bit about 3-somes in a christian marriage the author advocates 1 man and 2 women, but not the opposite, saying that the bible is against homosexuality between men, but not between women - betcha the author is a straight guy, who wants to see his wife make out with another woman and then f**k them both himself - classic fantasy and if he is deeply religious he now has the perfect excuse - god wants him to do it or at least says it's ok.
Well, polyamorous people believe it is not cheating on your partner to love and have sex with someone else as long as you other partner knows about it and that goes for both sexes.
Mormon men are allowed to have more than one wife, but mormon women can't have more that one husband - why, cos god says so.
God also wants that author to perform with his wife in front of the camera and wants him to film other couples too, but only if they are married to each other and making porn is good as long as certain rules are followed.
Yes, what we do in the bedroom comes naturally to us, because it is our biological function, ok some of us are wired differently, diversity in nature! I actually believe homosexuallity and bi-sexuality is nature's way of limiting overpopulation. Think about it, it makes sense if you take away all chemical and mechanical methods of contraception, what better way to limit procreation than to mate same sexes together.
We are primates with a higher intellectual function, so we experiment and chose what gives us pleasure and what doesn't - not just sexually - but everything in life. That's why whatever your sexual predelection may come naturally to you, may not be natural to the next person again taking environmental infuences into account.
To be honest I think that the person who wrote those articles is sexually deviant, but brought up deeply religious and has found a way to justify what he has perceived as depravity as the will of god and he can happily satisfy his sexual appetites without fearing god's wrath.
Right Professor Cassie is now stepping off the lectern, lol.
You are right in saying that it is thought provoking, though not in the way the author intended where I am concerned.