Should Government get out of the marriage business?

I've long thought government should get out of the marriage business - confining itself instead to legal civil unions. Since only consenting and competent adults are eligible to sign legal contracts, such as a civil union, that would eliminate minors and other people not able to make responsible choices. As for what goes on in the bedrooms, I take a libertarian view: Don't Ask, Don't Care. Frankly, people should be embarrassed to make judgments on other people's sex lives. Have they no shame?

As for Marriage, it should encompass all the legal rights and responsibilities of civil unions, but also add whatever moral and cultural strictures the Churches, Synagogues, Mosques, Shopping Malls etc. see fit to add. Let the free market decide what are the most popular arrangements. Let people have choice.