@ Buffaloballs, My husband is about your size and I can't say he doesn't satisfy me, he does and we have great sex life together but we also (both of us) enjoy 3some life style, it is a big turn on for us and we really like it. Our marriage got much stronger since we started this adventure but you can't base your marriage on mine, having another person/s into your marriage can cause a lot of harm to both of you. I must admit I was scared the first time we tried it with another guy and he was a bit bigger than my husband, he could reach my sweet spot and make me have out of this world orgasms, after few times I got use to it and I can say my marriage is solid as a rock, we both very happy. My fear was in case my husband couldn't handle it and we end up breaking up but it worked for us. I can safely tease my husband now about other FBs with bigger dicks especially the longer ones as they can reach parts my husband can't.
Just be careful and make sure you both open about it and no jealousy between you.