By anonymous - 15/10/2017 01:30
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To be fair, incest was a societal norm amongst those of high influence for thousands of years. Mixing all of their good "blood" with the commoners would dilute it. (another side note) There was also a practice of having an older relative introduce sexual practices to younger family members when they came of age. Just because we look down on this now doesn't inherently make it wrong or icky. We just know now that it causes genetic issues and should be mitigated.
I'm with you on this. Like you said, they probably shouldn't reproduce. But I think that its the social aspect that makes taboo into taboo. If a brother and sister are raised together, then one day they make out I would probably call them sick. However, in this situation the attraction came first. Yeah, the situation requires a serious talk, but they weren't thinking about their siblinghood before romance arose.
Multiple times I've heard the saying "girls marry men like their fathers". This doesn't only refer to the looks but also to the character of a man. We are all shaped by our childhood experience. If this woman adores and loves her father she surely will look for the same qualities in her boyfriend.
It is situations like this one is the reason why cheating is not acceptable. A cheater might not get caught (or at least not right away), but it can cause pain and whatnot to others. I am sorry to hear what happened to you, OP, as well as your half brother and everyone else affected by this.
It's a small town, everybody is related to somebody somehow. How else would the population grow?