"(The brother and sister) met later in life and felt an inevitable attraction..."

Twins separated at birth meet and marry. The marriage is annulled when the truth is discovered, but it's interesting to see this assertion that that the attraction was "inevitable." Is there something about the close blood relationship that causes attraction, that we only deny because we've learned the incest taboo?

David Alton, a member of the House of Lords, revealed their situation as a way of highlighting perceived shortcomings in the Human Embryology and Tissues Bill which is now going through Britain's Parliament....

"I suspect that it will be a matter of litigation in the future if we do not make information of this kind available to children who have been donor-conceived."

Yes, there are an awful lot of half-siblings out there — the fruit of popular sperm donors — who are going to meet and feel this "inevitable" attraction.

IN THE COMMENTS: Diane writes:

If I discovered my husband was my brother, I'd find a way to hide it. I love my husband, and frankly, I'd be unwilling to give him up. Now, I wouldn't have biological children with him--I'm not that twisted.

Am I alone?

This suggests a follow-up question. If you knew that a happily married couple were — without knowing it — brother and sister, would you hide it from them?