The logical consequences of cross-cousin marriage ( matrilateral or patrilateral ) for group formation were first discussed in detail by Reo Fortune and have provoked a great deal of debate amongst social anthropologists including Claude L�vi-Strauss, Edmund Leach and Rodney Needham ( alliance theory ).
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Due to this association, possibly reinforced by personal interaction with a specific cousin, he may become " fond " of her, rendering the relationship " sentimentally appropriate . " Interestingly, " patrilateral " cross-cousin marriage is the rarest of all types of cousin marriage, and there is some question as to whether it even exists.
