Bearman and Brückner (2008) argue that studies showing a fraternal birth order effect have used nonrepresentative samples and/or indirect reports on siblings’ sexual orientation.
The study was designed by J. Richard Udry, Peter Bearman, and Kathleen Mullan Harris, with special assistance from Ronald R. Rindfuss and Barbara Entwisle.
The first peer-reviewed study of virginity pledgers (by sociologists Peter Bearman of Columbia and Hannah Brueckner of Yale) found that in the year following their pledge, some virginity pledgers are more likely to delay sex than non-pledgers; when virginity pledgers do have sex, they are less likely to use contraception than non-pledgers.
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