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    Joined: Feb 2011
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    One of the scientific theories I read regarding why this birth order effect occurs is as follows.

    Initially, the female parent has a strong mechanism to reduce the effect of testoterone levels on male neurological development.  Each male pregnancy reduces the strength of this mechanism for future males.

    As each males prenatal testosterone level is determined by the individual male's genes, the effect will be seen to occur over a large sample size, but not necessarily within an individual family.

    So if the first male has high testosterone levels and the fourth male has low testosterone levels, then you might see the opposite end result than what the study would suggest happens on average.

    Realize the studies did not determine if all females have this suspected mechanism.

    Last edited by JamieH; 03/06/14 01:35 AM.
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    Good edit

    Last edited by Zen Scanner; 03/06/14 12:26 PM.
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    Yes, the more boys there are in a family, the more likely the later born boys will be gay. However, high testosterone is correlated with homosexuality, IIRC.

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    Anyway. People get very worked up about birth order. But I've read a lot on this for work, and I'll repeat: the findings are pretty anemic. There are some patterns, but due to the complexity of family structures, it doesn't really work very well to generalize. The thing I took away from it is that parents should be careful to directly talk to and play with second and subsequent kids in the early years, even though that can be kind of difficult.

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    Gay is not the opposite. Contrary to what most believe gay has been associated with a strong male brain in most cases. A highly prenatal testosterone level. Not necessarily at the highest level either, but near the highest.

    Wish more scientists would look at more than one of their studies and coorelate the results. It causes all this confusion out there.

    How people view masculine, feminine, what is more common in male or female is almost totally wrong. We make the mistake of not taking into account that our observations in everyday life are not a random sample, we make notice of some people over others.

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