Michigan is a purely "no-fault" state when it comes to divorce. In order to obtain a divorce, one spouse need only show that there are "irreconcilable differences," which means the marriage is so badly damaged that you can't save it. (Mich. Comp. Laws § 552.6 (1).)

Because Michigan is a no-fault state, it doesn't matter who's at fault for the divorce. The judge won't listen to evidence about marital misconduct, such as adultery. In fact, the person asking for the divorce can't even mention anything other than the breakdown of the marriage in the divorce complaint. This saves time, prevents mudslinging in the courtroom, and should reduce the level of conflict in the divorce.

But does adultery have any impact on divorce outcomes? Michigan defines adultery as "the sexual intercourse of two persons, either of whom is married to a third person." (Mich. Comp. Laws § 750.29.) Adultery is a felony-level crime in Michigan, but the state will only prosecute it if the innocent spouse files a criminal complaint within a year of the offense. (Mich. Comp. Laws § 750.30-31.)

In reality, prosecutions for adultery are rare. (Divorce Net)

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