Despite the urban myth reinforced by many a daytime talk show, researchers say the emerging evidence consistently indicates that very few fathers have unknowingly raised children who were not biologically their own, challenging the notion that it pays, evolutionarily speaking, to sleep around.

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Despite the urban myth reinforced by many a daytime talk show, researchers say the emerging evidence consistently indicates that very few fathers have unknowingly raised children who were not biologically their own, challenging the notion that it pays, evolutionarily speaking, to sleep around.