He was my first lover, but I had sex with him long before we were married. I played around a bit in an open relationship with him, as well. I was too young at 16, when I met him, to go through life having only been with one man and then settling down.
He had been with women before me, as he's older and had experience. We both benefited from the open relationship. We closed the relationship to only the two of us before we got engaged, after nearly 5 years open.