Is there a sensitive period in human incest avoidance?

From the book : Evolutionary Psychology 9 issue 2 : 285-295.
Many studies support the proposition that early cosocialization with opposite-sex children has the effect of inhibiting later mutual sexual attraction, but the existence of a period in the life cycle in which individuals are sensitive to the effect of early cosocialization has been a matter of controversy.
Drawing on earlier traditional psychological research, and on more recent work guided by parental investment theory, we hypothesized that only for maternal perinatal association (MPA)-absent males a less-than- around-three-years age difference with the sister can predict stronger aversion to sibling incest.
The results corroborated the hypothesis.
The results can be interpreted as support for the existence of a sensitive period as well as for the potent role of MPA.
Cross-cultural comparative studies were called on to further test the hypothesis.