The patterns of sexual maturation indicate that girls mature earlier in home environments devoid of fathers .Conversely in an environment where the smells of the fathers dominate the maturation gets significantly delayed. Likewise girls with sisters are likely to have their maturation delayed perhaps because competition for mates reduces chances for mating.. What this means is that nature discourages inbreeding. Where mating takes place between close blood relatives the chances of defective recessive genes occuring become greater .Related parents are more likely to have similar genetic mutations and therefore children of incest are at a high risk for birth defects and disease.
The Pennsylvania State University team which has published these findings attributes the effect to pheromones which are nature’s way of thwarting inbreeding.
http://www.seedmagazine.com/news/2006/09/scent_of_family_guides_girls_m.php
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