RE: Incest; It's generally accepted that family members, particularly parents, have some sort of control over you, which means that it's taking advantage of a person. People who are related and have sex is rather... ick in the first place. There's just something creepy about it.
Asked by Anonymous
Creepy ick isn’t morally wrong.
Also, if he’s an adult offspring not supported by his parents, there is no control issue. Even aside from that, do you see brothers having sex as wrong?