Except for the bit about sex, I would say that your perspective matches mine fairly closely.
I don't have a problem with sex without marriage, and if I did, it wouldn't matter one whit, just as it doesn't matter to most Catholics that the Pope forbids it, or it would matter to most Americans if a President Santorum expressed his displeasure with it.
Sex transcends simple lust and biological urges when love is involved, but, in my opinion, marriage is not required to elevate copulation to love making.
I'm not all that concerned with simple recreational sex, but I do believe the number of people who practice it are very few. Unfortunately sex remains a powerful force within the American psyche and there are far more people engaging in it for neurotic reasons than for simple pleasure.
The notion that "liberated" young women are, in great numbers, engaging in sex outside of marriage for pure physical satisfaction is ridiculous. Far too many are doing so to be accepted within a sub or micro culture as "cool" and there is no question but that the number of young women engaging in sex to be loved is legion.
I have a very big problem with hedonism. A mindless pursuit of pleasure through any source is destructive, and never satisfying.
I've really no problem with committed homosexuals getting married, but I do have a problem with the idea that in order to prove one's tolerance, one must not only accept monogamous homosexual relationships, one must tolerate the deviant element of the gay population.
The folks who march in Gay Pride parades in g-strings and Plaster-of-Paris phalli are deviants and I'm not going to "tolerate" them anymore than I will "tolerate" heterosexuals simulating or engaging in sex in a Carnival parade.
A gay gene seems to me to make some sense but I very much doubt it covers everyone who self-identifies as homosexual.
My liberal sister-in-law who would emasculate her husband if he cheated on her, has "empathy" for married men who cheat on their wives with men. This is what liberal thinking requires.
If you don't think cheating on a spouse is a big deal then the gender of the person your spouse screws doesn't matter, but if cheating is a fundamental betrayal, then you don't get a pass because you claim to be a long suffering gay man or woman.
And this leads me to an element of the conservative vision that you may have missed: Personal accountability.
Bi-sexuality is a hedonistic practice, not a "normal" state of being.