Making excuses for sin is as old as Eden.
Evolutionary explanations are highly fashionable for all manner of sin.
The story purported to give 'reasons' why our alleged evolutionary history has programmed us to cheat on our spouses. But it's not just adultery. Caring and sharing' ape-men enhance the whole group's survival, and so such genes are more likely to be passed on, even if only in one's siblings or cousins. Homosexuality is another area in which the fad for evolutionary explanations has taken root. The research work suggesting a so-called 'gay gene' is now regarded as suspect by just about everyone.