Timing of Intercourse and the Sex of the Baby
Some have argued that the timing of intercourse in relation to ovulation can influence the sex of the conceptus [25]. We tested for any association between timing and the sex of the infant by dividing live births according to whether the babies were boys or girls and again plotting the distribution of cycles during which conception occurred according to the day of most recent instance of intercourse Figure 4. There were no systematic differences between the patterns of intercourse that produced boys and the patterns that produced girls.
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