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A mother and her son are meant to be lovers. A 1991 Danish study has found that the size and shape of a son’s penis directly correspond to the size and shape of a mother’s vagina. This is proposed to be an evolutionary response that developed to ensure successful insemination of mothers by their sons, a practice common in early human tribes, where the sons took over the roles of fathers who were killed while hunting. The results of the study are further confirmed by mother and son couples who report increased sexual compatibility of their sex organs.

It really didn't take a study to figure this one out, but I'm glad they did.