There could be some biological reasons.

来源: QualityWithoutName 于 2008-12-15 11:54:00 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (79 bytes)
回答: Father, daughter and puberty (zt) 由 QualityWithoutName 于 2008-12-15 09:58:21

Another study I posted above clearly considered social economical status (SES).

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