A new study of 169 newlywed heterosexual couples found that after the first 18 months of marriage husbands became more conscientious, and wives became less anxious, depressed and angry. However, husbands became less extroverted, and both husbands and wives became less agreeable.

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A new study of 169 newlywed heterosexual couples found that after the first 18 months of marriage husbands became more conscientious, and wives became less anxious, depressed and angry. However, husbands became less extroverted, and both husbands and wives became less agreeable.