Actually it seems that it's more a symptom of lack of sex leading to overwork than vice versa. A survey of 32,000 men and women by researchers at the University of Goettingen found over 35% of those reporting "unsatisfying" sex lives tended to use hard work as a diversion.
They were surveyed for the newsletter "Apotheken Umschau". My guess is this same symptom applies to other countries as well. Meanwhile, head of the study, in an understatement, said "These findings are worrying." Well, probably more for the people missing out on sex than anyone else. Personally, I could think of other, ahem, diversions that might help their sexual tension.