Also, because marriages between two closely related individuals are rare in hunter-gatherer societies, the study was based on a small sample, which could have skewed the results.

Now, there may be other reasons that this arrangement is bad.

I would certainly be very uncomfortable with a first cousin arrangement since this would be very close to the biblical prohibition.

By contrast, in a foraging society, it might make more sense to be part of a much larger, interconnected group, since there are few or no resources to be inherited.

It's tempting to think that people in agricultural societies might intermarry purely out of convenience, since they're less likely to encounter new people as often as hunter-gatherers might. Agricultural societies tend to be much larger than hunter-gatherer ones, so if anything, the reverse might be expected.

I can't find anything in the Bible about this subject, but we are taught that it is not right to date your family.

I am having a problem with this because my child is dating my 3rd cousin, and in my heart I feel it is wrong. The following verses in Leviticus eighteen give a list of those who are too close of kin to marry.

Another factor to consider is that in established, highly stratified societies, members of the upper class or royalty would have intermarried simply to preserve their social status.

They may have also had more surviving children because they had greater resources for supporting these families.

In traditional residential societies, couples who were more closely related to each other had more children.