Why are men unfaithful?

A new report suggests there's a genetic reason why some men are born to cheat. But experts argue that's just a convenient excuse - family, culture and communication are also key factors. Cathy is blonde, 5ft 2in and in her early forties. Living in London with four children, her world fell apart two years ago when Dave, her partner of 20 years, left her for a girl half his age. Times_Online_Article...