There are several incest forums, but unfortunately most of them are filled with graphic ads and porn. Most members on the boards aren't even involved in incest and they often ask others for their pictures so they can fantasize about the person. Some people even make up an experience and I don't understand why you would want to lie about being involved in incest. Sometimes it can be hard to tell if a story is true or not. I like to look at pictures, but most of them are full body nudity. I only know of five forums that do not allow pornography:
Cousin Couples: Because of my own experience I was originally only interested in cousin relationships, but then I delved into closer types of incest. Their main website also has some interesting tidbits about cousins, including a breakdown of the state laws. I remember reading a story on the website about half-siblings and another about double-cousins, which is genetically equivalent. The term is based on a relationship where two siblings marry two siblings from another family and thus their children are related to both families. Cousin relationships used to be more common and there are several famous examples. I think first cousin marriages should be allowed in every state. I wrote to several of my legislatures, but they weren't interested in changing the law, even with restrictions.
Genetic Sexual Attraction: This is probably my favorite website about incest because it is more likely to be about real people and the members are mature. I think of these relationships as slightly different than regular incest. The term refers to people who were adopted and when they reunite they feel a strong passion towards their relative that they haven't known. It is basically like getting involved with a stranger, except you share the same genes. There are a lot of half-siblings on the website, which makes sense as you are less likely to grow up with them. One of the couples even became famous and was in the news.
Penny 4 Your Thoughts:This forum includes a few topics, not just incest. Penny is an Australian woman involved with her twin brother.
Incestuous Lovers: You have to register to see most of the content.
Brother Sister True Love: This is a small forum that doesn't have much activity yet.