In a Chinese factory that is engaged in manufacturing pesticides like guanidine nitrate, it is reported that only married men are employed. An explosion in the factory at about 0930 hr on 28th Feb 2012 led to 13 deaths and scores of injuries. The blast led to collapse of a workshop and breakage of window panes in 2 km radius. Tremors were felt by three villages nearby.
I am unable to guess the reason for only married male employees in the factory.