Brothers dating same girl
It goes without saying that these new volunteers were not made aware of the purpose of the experiment; they didn’t know that the photos they saw were of anyone's brothers or boyfriends — as far as they knew, these were all randomly selected, unrelated men.
Because each page of the albums presented four possible choices — the volunteers could choose any of the four partners as the closest physical match for the brother — the odds that the volunteer would select the correct partner as a match for the brother were one in four, or 25 percent.
This means that humans, like and other sexually reproducing organisms, have a problem — finding a partner who is genetically similar but not similar.
The well-known Westermarck effect prevents us from developing a sexual attraction to our siblings.
In 2009, Demi and Miley’s brother Trace Cyrus flirted on Twitter for months before finally dating IRL.
However, Saxton found that women were slightly more likely than chance to rank the correct partner as the best match: 27 percent.
The volunteers were also more likely than chance to rank the correct partner as the second-best match (32 percent) or third best match (26 percent); the correct partner was thought to look the least like the brother only 16 percent of the time.
Might go anywhere from a friendly rivalry, one deciding that they want their siblings to be happy or straight into Cain and Abel territory.
In Fairy Tales, often inspires the Bride and Switch. See also Two Guys and a Girl, Sibling Rivalry, and Settle for Sibling.
in a kibbutz or in the home of a blended family) can have the same effect.