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“Parents of daughters, it seems, have an interest in reducing male promiscuity and encouraging greater male investment in their children, consistent with the conservative family policies of the Republican Party,” ...“Parents of sons, in contrast, are more accepting of teen sex and more liberal policies. ... “Having sisters makes males more politically conservative in terms of their gender role attitudes and their partisanship,”
http://shine.yahoo.com/parenting/why-par...45580.html