Submissive ???

My husband and I have been having sex for 3 years and it's always good, but we have different... tastes I guess. I want him to spank me and grab me and tell me what to do, but he wants to just "be normal". I think he thinks I want 50 shades of grey type things like whips and handcuffs (being in handcuffs is a fantasy but I wouldn't ask him for that) I really just want him to be more aggressive and assertive. I call him daddy which he likes now more than he used to, and he spanks me if I ask but it's awkward and not sexy at all. I'm not usually turned on and hardly ever orgasm. Any ideas on how can we find a happy medium?