If the extent of your conversations with him are only about "the great sex" then he is a F buddy.
I would agree with that but more....
If the discussion isn't about anything else other than sex, he's a fuck buddy.. he isn't a friend and he certainly isn't a bf
If he isn't concerned about who you are, what you do, how you do it and the focus is on your body, exclusively, he's a fuck buddy
If you have a friendship, know the guy, who he is, his life, his background, but don't view him romantically... he's a friend with benefits.
If he's concerned about you, who you are, wants to be a part of your life and is interested far beyond a physical connection, he's bf material.