i doubt discussion of these sorts of topics are endorsed by the staff, and the rules [https://www.fruityrumpus.com/forums/rules] forbid explicit text and images as well as discussions of adult/minor relationships. But other than that it's sort of in a grey area? id play it safe and not discuss it, maybe bring it up with one of the mods. idk if sfw discussion of incest or what have you falls under the forum's definition of 'explicit'.