He didn't know it when he was boinking her before??? What we have here is a terminal case of Liberalism . . .
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but, wait, he finally admitted he was mistaken. That makes him saner than your average liberal.
I remember a case of mother-son incest that was discussed as part of a sociology class I was taking. The woman had her son when she was 13 or 14 and gave him up for adoption. About 20 years later the son went looking for his biological mother. He found her but she claimed to be the mother's old roommate and that his mother was dead. Well, she must have still be attractive as as relationship started and they got married. As they finished consummating their marriage, she admitted to him that she was his mother. He filled for an annulment the next day.