Open marriage means both can fuck around, the other one is only the wife can fuck around (hotwife/cuckold). This is explained in the conversation they have after you choose either choice.hey whats the different between open marriage and "fuck another dude" choices?
In terms of content, there currently isn't any difference, except that if the husband fools around with another girl, it's considered cheating. This doesn't have any repercussions yet.