I am not very good at monogamy and I get bored easily. I prefer to have many different partners. However, I have been with the same person for 5+ years and I love him very much. Even though I often feel sexually stifled, he would not want me to see other people (he is very traditional) and so... I don't.
I am currently single, but it would depend on the dynamics of my relationship. Technically, no matter what, I have the freedom to do as I please. However, I am generally very devoted and loyal to my lovers and only have one sexual partner at a time.
Have you thought about discussing it with your partner?
I remember when I asked my husband. It took him a while to say we could try it out. Because our relationship is already so strong it has only made things better for us (even though we rarely act on the freedoms).