Check it out: my new post at the fantastic WriteSex site just went up. Here's a tease (for the rest you'll have to go to the site):
Like bestiality—and unlike underage sexuality—incest is a tough nut: it’s not something you might accidentally insert into an erotic story. Also like bestiality, it’s something that can definitely push—if not slam—the buttons of an editor or publisher. Yet, as with all of these “sins,” the rules are not as set in stone as you’d think. Hell, I even managed to not only write and sell an incest story (“Spike,” which is the lead story in Dirty Words) but it also ended up in Best Gay Erotica. The trick, and with any of these erotic button-pushers, is context. In the case of “Spike” I took a humorous, surreal take on brother/brother sexuality, depicting a pair of twin punks who share and share alike sexually, until their world is shattered (and expanded) by some rough S/M play.
As with any of the “sins,” a story that deals with incest in a thought- provoking or sideways humorous manner might not scream at an editor or publisher I’M AN INCEST STORY. Instead, it will come across as humorous or thought-provoking first, and as a tale dealing with incest second. Still, once it comes to light, there’s always a chance the story might still scream a bit, but if you’re a skilled writer telling an interesting story, there’s still a chance quality could win over the theme.
Unlike bestiality, incest has very, very few stretches (like aliens and myths with bestiality). It’s very hard to stumble into incest. In short, you’re related or you’re not. As far as degree of relationship, that depends on the story and the intent: immediate family relations are damned tough to deal with, but first cousins fooling around behind the barn are quite another.