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The fetishes themselves are likely a result of environmental factors (exposure to something during key periods) The traits which make someone more or less open to embracing and/or acting on them is a function of personality, which is largely heritable (although not entirely)
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look into it please, your last research about sexual fetishes in relation to political views has been the main topic of conversation with my friends for quite a while :)
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Any fetish that enables effective reproduction would probably be passed on. A preference for a youthful mate is probably a strong selector, but genes don’t know how to draw lines for puberty.
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