Start with one, end up with both. I have a bunch of friends that I enjoy talking to; some on certain subjects, a few are good conversationalist in just about every topic under the sky. Yet, I cannot imagine another relationship that is more than platonic with them. In my experience, when you get physically attracted to a person; a conversation is unavoidable. And when you DO love a person, you care about their interest and dreams, vice versa and the sharing begins. I have known people who loves their spouse deeply, yet all they do is spend time together without a lot of talking.
Mr.X is reading on the porch, Mrs.X sits next to him, knitting. Mrs.X puts down her knitting and stepped into the house. A couple of minutes later, the sound of soft music drifted out to the front. Mr.X smiles and place his book on the side table, he stood up and turn to the front door as Mrs.X walked out. Both smiling, Mr.A open his arms in a welcoming gesture as Mrs.A moved in to the steps of their favorite dance.
Sometime, the deepest bond isn't all about spoken words but the easy understanding and knowing you are perfect for each other.