AWinterJ posted... Yes. Simply because it's not fair on the kid. Also the risks involved are not worth taking. They are both adults so having sex isn't that much of a issue but creating and bringing life into that situation is fucked up.
Inbreeding increases the chances that genetic imperfections are expressed since you are more likely to receive to defective copies of the same gene the closer the relation. Just ask the Habsburgs about it.
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