Polyamory and Half Siblings

I was asked a question recently.

Q: In a poly family (say husband-wife-wife, all unrelated) is consanguineous sex between the half siblings of more, less, or average frequency?

A: It probably depends.

I'm not aware of any studies on this, so we need to look at this based on what we already know.

A) We know that half siblings who aren't raised together have a high likelihood of experiencing a strong attraction when they meet or are reunited post-puberty.

B) We know people raised together in close quarters, closely related or not, often develop and aversion of being sexual with each other (Westermarck Effect), or at least a suppression of sexual attraction for each other, but many siblings, whether full, half, step, or adoptive, raised together do experiment and some get more serious. To experiment, minors or anyone still "living at home" need not only the curiosity and/or attraction, but they need privacy or at least be allowed to experiment.

C) We know that polyamorous families are diverse, with varying parenting styles and attitudes towards sex. If the Westermarck Effect is at least partially the result of socialization ("nurture") rather than being exclusively nature (such as genetic), then parenting can make a difference.

D)  home in which the parents aren't a polyamorous triad or "V" might be a single parent home, a home with two parents, a parent-stepparent home, a parent-grandparent home, or other combinations.


On what could make the consanguineous sex less likely...

When there three adults/rather than two or one, that could mean the the minors or young adults have more supervision. Also, when there are parent-stepparent monogamous homes, if that means stepsiblings who haven't grown up together living together, at least part of the week, that could be the situation in which there is more likely to be experimenting between the (step)siblings.

Half siblings NOT raised together are generally more likely to get getting together than ones raised together.


On what could make the consanguineous sex more likely...

People who are living polyamorously might be more likely to recognize that arbitrary or outdated taboos on sex can be discarded, and might pass along that thinking to their children.

Children raised in such a situation might be closer in age to their half sibling than in a home in which their "monogamous" parent has made and raised children with two or more different partners, but only one at a time for a phase of life.

So, unless the issue is studied more, who knows?

Now, upon first reading the question, one might picture a FMF polyamorous home is raising half-siblings together in an environment in which sex is not a forbidden subject; in which the children were raised with knowledge of sex, various relationships, and the importance of consent and supporting all consensual sexuality, one might think this will encourage teen sex, but it isn't necessarily so. Good sex education doesn't cause teens to have sex earlier or with anyone in particular. But it does mean that if they do have sex, they are more likely to know what their options are as far as consent, protection, contraception, etc.

Maybe someone raised in a FMF polyamorous home will comment below? Anyone can comment, and can do so anonymously.