Catholics and Natural Law

What is "Natural Law"?  Look it up in Wikipedia and you would be forgiven for believing that it can mean almost whatever the user wants it to mean. 

Catholics appear to define natural law as the rule of conduct which is prescribed to mankind by the Creator in the constitution of the nature with which He has endowed mankind.  Recently I've come across the expression several times in discussion with Catholics, who declare it as a kind of self-evident trump card.  As in "homosexuality is wrong - It's against natural law".  When looking natural law up at a website calling itself "Catholic Encyclopedia" I was surprised to be given as an example of natural law that in certain circumstances Polygamy can be lawful but that polyandry can never be lawful, presumably because of something written by a misogynist in the Old Testament.

I find myself wondering how laws which to a modern reader often appear bizarre, and are prescribed by a supernatural being, can possibly warrant the title of "natural".  Moreover, not even Catholic scholars through the ages can agree on the detail. Is it perhaps time to drop this rather unhelpful expression?

The Bible and Submissive Women

Two ministers in the Church of England are refusing to backpedal from their reiteration of the biblical teaching that wives should “submit” to their husbands. The Rev. Angus MacLeay, and his assistant, Mark Oden, have come under fire in the media after they recently issued a pamphlet and sermon, that quoted Paul’s letter to the Ephesians (5:22-33) and said that old fashioned values would save marriage.
The quote from Ephesians states: “Wives, submit to your husbands as to the Lord. For the husband is the head of the wife as Christ is the head of the church, his body, of which he is the Saviour. Now as the church submits to Christ, so also wives should submit to their husbands in everything.”

I've been participating in a blog discussing the submissive role of women in the Christian church.  I find it revealing that without exception the proponents of female submission appear to be grey haired middle class and/or extreme right wing men.  I just cannot understand, try as I might, why anyone in 2010 should cling to the dubious theological figleaf that is Peter's mysogynist preaching - apparently because he was the vessel for God's infallible wisdom.
Count me out of this ridiculous religion!