Dr Prem Misra, an expert on sexual problems, said: "Basically, bigamists have abnormal personalities whereby they get a little bit of satisfaction and pleasure from keeping things going.
The maximum sentence is seven years in jail, although judges are rarely so harsh and the average sentence for convicted bigamists is four to six months.
BBC documentary Bigamy, Stories Of Deception catches up with various bigamists - all in the multiple marriage business for differing reasons, all with their own stories to tell.