This is discussed in Blaffer as well; the reason that Blaffer gives is that younger children compete with the boyfriend for attention. She notes that only very young children have an instinctive response to strange males (bearded males especially). If that were Haidt’s claim, I would say, yeah, there’s definitely evidence for it.
Note also that the alternatives to a boyfriend are often not two genetic parents, but one.
This is discussed in Blaffer as well; the reason that Blaffer gives is that younger children compete with the boyfriend for attention. She notes that only very young children have an instinctive response to strange males (bearded males especially). If that were Haidt’s claim, I would say, yeah, there’s definitely evidence for it.
Note also that the alternatives to a boyfriend are often not two genetic parents, but one.