... 'cest is best," as we used to joke about incest when we were teenagers.
For anyone who is any doubt that this is 'next on the list', go to this article in the Times: I had sex with my brother but I don't feel guilty. You can skim the article, but read the comments carefully.
Then say to yourself, "How would I dispute their conclusions?"
As one comment puts it, "It is only through airing experiences such as this that any progress in society can be made. 100 years ago it would have been an article on homosexuality..."
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