Maybe you should expand your horizons. grin -- The Author
Ok, I'm all for trying new things and all, but the world-wide cultural taboo against incest exists for a clearly defined reason (ref: Alexei Nikolaevich, for example), not just because we're all a buncha prudes.
Of course it does. In other news, shooting people in the streets is generally considered bad, yet if you read a few thrillers and watch a few action movies, there will be gun battles. Fiction and real life: not the same.
With freely-available contraception and abortion, it's hard to think of any good reason for the absolute cultural taboo against all incest.
One of the goals of literature should be to challenge cultural taboos. Any good bookseller should realize it.
It is worth noting though that cultural mores don't work well with shades of grey- they are best suited to black-and-whites. (i.e. do/don't instead of do this way/don't do that way)
And, you know, child rape by a family member. Which is probably, by far, the most common form of incest.
Consider this. In certain northern states of India, marriages or relationships within the same village are considered incest and draw very violent reactions ( even leading to deaths). There is a very strong demand to make it into a law. On the other hand, in certain southern states and in some communities in north as well, it is perfectly fine to get married to a cousin from your mother's side.