BIgamy

Bigamy is when someone marries another person while they are legally married to another person. It is a crime in this country to do so. It is wrong especially if the first wife or husband does not know about this as they are being cheated. The bigamist seems to be living double lives, that just seems so hard and stressful, how do they manage to do it??? But one thing i don't understand is if someone is having an affair why is that not a crime? Its just as bad, having an affair or getting married, I'm sure the first partner would be totally against it! So they should get the same sentence, the sentence varies from 9 months to seven years.
http://fightbigamy.typepad.com/my_weblog/2005/09/what_is_bigamy.html