From Chateau Heartiste: You’ll notice as well that the sort of stuff women primarily gossip about — sluttiness, infidelity and fatness — to cut down their female competition, are exactly the character flaws and vices that feminists claim should be free from judginess, and accepted by everyone, especially men. Why do feminists focus on these things? Because they know they matter. Men really are less likely to commit to sluts, whores and fat chicks. And for good evolutionary reasons. (Not to mention good aesthetic and tactile reasons.)
An interesting question is why, if gossip is, presumably, evolutionarily adaptive as a means of reducing the mate value of sexual competitors, men don’t do the same thing? Where are all the male yentas tearing down the competition?
First, men have their own version of gossip; it’s called winning. Men kneecap male competitors by fighting and defeating them, physically, mentally or socially. Second, women are more intuitive than men are about reading subtext in gossip.