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" .. Stay or stray?
Evidence for alternative mating strategy phenotypes in both men and women .. "

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LINK: [a creative commons source]

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A certain percentage of men & women tend to 'break out' of a long lasting partnership every once in a while. With no bad conscience the most. Now there is evidence from research that this is totally 'normal' for some, while others would never even think of it.

I am sure - after reading the full text - that it has always been like this. The only difference seems to be that nowadays people dare to admit it & talk about it freely.