Unexpectedly, our results have shown that there is a trend for fathers having 1.1 times stronger preferences for feminine faces than childless men (OR = 1.11 [0.99–1.24]; F 1,25725 = 3.57; P = 0.059, S14), but this almost significant effect varied strongly between men with different siblings’ age, number and sex (for additional details, see S15–S17).
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