Is infidelity natural? We first need to decide what is meant by “natural.”  If we mean socially acceptable, the answer is no. Surveys conducted around the world show that nearly all men and women view infidelity as extremely negative.  If we mean commonly practiced, the answer is, again, no.  Surveys of adults living in the US reveal that 75 to 98% (depending on the population surveyed) are faithful to their partners. However, if by natural we mean a product of our evolutionary heritage, the answer might be “maybe.” Fidelity with an appropriate mate would help offspring reach maturity; however, infidelity may have been an adaptive trait for some to survive.

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