I am not a guy, but here's my 2 cents...guys are generally NOT chatty.
My husband and I have been married for 8 years, and we frequently run out of things to talk about. When we were first dating and finding out about each other, we could have deep meaningful conversations for hours on end. We still have very deep conversations on a variety of issues, including our daughter and the new baby on the way, our parents and siblings, our friends, current events, our respective jobs, our interests and hobbies, etc., but we just don't have a 24 hour a day chat-fest like we did in the first six months we were dating. Some topics only need to be covered once, or every once in a while.
My advice, just don't sweat it. I have found that guys in general usually only like to talk when it is absolutely necessary or when there is an important issue to discuss, especially when they are comfortable in a relationship. As long as you are communicating about important issues, don't worry that your boyfriends don't always want to chat. That is why guys are sometimes such good listeners. And if you keep nagging them about not talking, they may start to get annoyed and clam up even more.