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Men who habitually insult their wives or girlfriends do so, somewhat paradoxically, as part of a broader strategy to prevent them from leaving for someone else – what evolutionary psychologists call 'mate retention'.

The men were also asked to report their use of 104 mate-retention behaviours, such as whether they became jealous when their partner went out without them, and whether they checked up on where their partner said they would be at a given time.

The men who insulted their partners more also tended to engage in more mate-retention behaviours. A similar association was found in a second experiment in which a separate sample of 372 women were asked to say how often their partners insulted them, and how often they engaged in mate-retention behaviours. The researchers said insults might serve a mate-retention function, by making a “woman feel that she cannot secure a better partner, with the result that she is less likely to defect from the relationship.”