I believe in certain moral absolutes also, that murder is wrong, for instance. But beyond a few basics concerning life and liberty, most of what people call moral law is really just religious imperialism. Being that I don't want Muslims imposing Sharia law on me, I tend to give pretty wide lattitude to matters of morality beyond the fundamentals.
Moral guidance is for the home and church, not the legislature.
You say this so quickly after admitting to moral absolutes like sanctions against murder? Shame on you.
I am glad that you recognize the rights to life, liberty, and the pursuit of happiness only exist in a particular moral worldview. I'm sorry your exploration into the moral reality stops so short. Just because something is difficult to study doesn't mean you should not study it.
The moral laws on sexuality are also very universal and are based on heterosexual marriage as the proper expression of human sexuality. You might ponder that while you are pondering these issues at all.
Shalom.