You can be emotionally incestious or biologically incestious . If you have sex with someone who you ' ve never met before and then later find out that you ' re actually second cousins , it ' d be silly to be like well because of this sharing of genes we can ' t be together romantically . On the other hand , if you grow up familialy related to someone regardless of whether you ' re biologically related then incest is pretty messed up , because you have an existing relationship that cannot coexist with a romantic one . You then have ingrained and evolutionarily backed inclinations against romantically being with them . <| sep |> Everybody asking about Thielen , does this mean Rudolph is a must start now ? What if you have someone like J . Cook ?