Wife's pals can wreck husband's sex life
Middle-aged men are more likely to have a poor sex life if their wife is close to their friends -- because it undermines their masculinity.
A US study found that in middle-aged and older men, when the woman gets on better with his friends than he does, his sex life suffers.
The phenomenon was dubbed "partner betweeness", in which a romantic partner comes between a man and his friends.
Prof Benjamin Cornwell, of Cornell University, said: "Men who experience partner betweenness in their joint relationships are more likely to have trouble getting or maintaining an erection and are also more likely to experience difficulty achieving orgasm during sex.
The study found partner betweenness undermines men's feelings of autonomy and privacy, which are central to traditional concepts of masculinity.
The authors said there was nothing wrong with the wife organising most of their social activities -- but they added that reducing a man's contact with his friends was not healthy, suggesting that so called "boys nights" could, in fact, be a good thing.