When should incest between consenting adults be allowed and when should it not be allowed?

It should always be allowed between consenting adults. But that doesn’t mean it is always a good idea.

CONSENSUAL incest is not wrong. (Abuse victims: being abused by a relative does not make it wrong for others to have consensual incest, any more than rape by a stranger makes all sex wrong. Sex and assault/molestation are two different things.) An aversion became common in humans that aided in population growth as one disease couldn’t wipe out the human race. That’s not a problem anymore.

Consensual incest is very common. You know people who have been involved, whether you know it or not.

There is no rational reason for keeping laws or taboos against consensual
incest that is consistently applied to other relationships. Personal disgust or religion is only a reason why one person would not want to personally engage in what I call consanguinamory, not why someone else shouldn’t do it. An adult should be free to share love, sex, residence, and marriage with ANY consenting adults. Youthful experimentation between close relatives close in age is not uncommon, and there are more people than you’d think out there who are in lifelong healthy, happy relationships with a close relative. It isn’t for everyone, but we’re not all going to want to have each others’ love lives, now are we? If someone thinks YOUR love life is disgusting, should you be thrown in prison?

Some people try to justify their prejudice against consanguineous sex and
marriage by being part-time eugenicists and saying that such relationships inevitably lead to “mutant” or “deformed” babies. This argument can be refuted on several fronts.

1. Some consanguineous relationships involve only people of the same gender.

2. Not all mixed-gender relationships birth biological children.

3. Most births to consanguineous parents do not produce children with significant birth defects or other genetic problems; while births to other parents do sometimes have birth defects.

4. We don’t prevent other people from marrying or deny them their reproductive rights based on increased odds of passing along a genetic problem or inherited disease.

It is true that in general, children born to consanguineous parents have an increased chance of these problems than those born to nonconsanguineous parents, but the odds are still minimal. Unless someone is willing to deny reproductive rights and medical privacy to others and force everyone to take genetic tests and bar carriers and the congenitally disabled and women over 35 from having children, then equal protection  principles prevent this from being a justification to bar this freedom of association and freedom to marry.

Some say “Your sibling should not be your lover.” That is not a reason. It begs the question. Many people have many relationships that have more than one aspect. Some women say their sister is their best friend. Why can’t their sister be a wife, too?

Some say “There is a power differential.” This applies least of all to siblings or cousins who are close in age, but even where the power  differential exists, it is not a justification for denying this freedom  to sex or to marry. There is a power differential in just about any  relationship, sometimes an enormous power differential. To question if  consent is truly possible in these cases is insulting and demeaning.

Some say “There are so many people outside of your family.” There are plenty of people within one’s own race, too, but that is no reason to ban interracial marriage. So, this isn’t a good reason either. Let consenting adults love each other the way they want!

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