The Law of Unintended Consequences

It would appear that the Law of Unintended Consequences is going to affect the government's proposed same sex marriage bill which is being debated in Parliament tomorrow, Tuesday 5 February. It would seem that adultery will have to be either redefined or abolished as grounds for divorce the current definition is of having sexual intercourse with a person of the opposite sex with whom you are not married. The definition of "consummation of marriage" will also have to be changed.
There is also a "demand" that related closely related people be allowed to marry to gain the legal and financial advantages that go with being married or in a civil partnership. I have no doubt that David Cameron had the best of intentions when he started out with this legislation; but it will come to haunt him. It is a great pity that he does not have some experienced (old) advisers who to take a considered view on all new legislation rather than bright young things with no experience of life outside of Westminster "political village".