Welcome to the forums.
There are many forms of Open Marriage, but most of them fall into two broad groups - Swinging, where sex is the primary focus, and polyamory, where loving relationships are the primary focus.
Which is not to say that there's no sex in polyamory, or that swingers can't fall in love - it's just what the main driving force it.
Have you and your partner discussed which sort of direction you want to go?
"Listen, or your tongue will make you deaf." - Native American Proverb