Ok, so what's the difference if I'm genetically inclined towards an impulse to procreate with an already married woman, or if I'm genetically inclined towards an impulse to relate to another man? Why does one seem like it shouldn't be a sin more than another?
I already answered that. All societies have "ground rules" as far as what is and what isn't proper conduct, and religion is often a factor but it's almost never the only factor.
Yeah, I have the same question. What's the big deal if I love an already married woman? I'm genetically predisposed to loving women. Does that mean G-d messed up when making my genes? Am I never supposed to be allowed to express my love for her just because she's married?
See above.
BTW, one can express their love for another in different ways, and I would suggest respecting them is probably #1. One does not have to be religious in order to know that this is a good course to take, even if it's just for selfish reasons: "what goes around tends to come around".
Alternatively, genetics and predisposition is not an indication of what is sin. Half the 10 commandments are things we are not naturally inclined towards. G-d commanded that we honor and fear our parents.
You and I look at Torah quite differently, plus I would suggest that honoring our parents is basically found in probably all religions and secular societies as well. What many call "the Golden Rule" is commonly taught, not only through religion but also in secular humanism. Compassion and altruism is strong in smaller human groups, but unfortunately it often gets watered down in larger, more impersonal societies. Gandhi's emphasis on the further development of cottage industries and greater emphasis on smaller local sovereignty is a good direction to go in for that very reason, imo.
In my opinion, a lot of it is about how today people are more into getting society to accept their faults rather that putting in the blood and sweat that is character refinement and self-improvement. Perhaps there is no imperative for self-improvement in a secular community without a higher Authority requiring it and so forcing society's hand is the easier choice.
Your position that a secular society is somehow amoral simply is wrong, as all societies, including those whereas religious observance is very low, have morals and laws to reflect the morals they chose to have. Japan and the Scandinavian countries have very low rates of religious observance, and yet they have relatively low crime rates, and the latter spend more per person to help their poor than most other societies.
We see cannibalism, robbery, incest, murder, self-mutilation and a host of other bad qualities (for humans) by animals too. I don't think this is a good argument.
That's a non-sequitur based on what I have posted since you're implying that I am advocating having a devil-may-care society w/o morality, which I not only am not saying. You also ignore the fact that all societies have morals that they teach and put into law, regardless as to their ultimate source.
However, morals and laws are not uniform from one society to another, but that's also true of different societies that even may be dominated by the same religion. Take a look at the variations between Christian societies worldwide, for example.