Erin, I hope you don't think you're addicted to sex because you want it more than once a month!
I have only been to regular therapists, not sex therapists. But I do know a couple who have gone to sex therapists and felt it helped them very much. They got much more comfortable with expressing what they wanted to each other, and learned new things!
But yeah, a third party who has training to observe how two people relate to each other is always helpful for gaining perspective and getting out of the "trees" view to see the whole forest!