My psychology classes would say that's normal. A guy's imperative is to grab the girl and consummate. That is his prime directive.
A woman's imperative is to make sure it's the right guy. After all she's the one stuck for 2-3 years once mated with, and she wants a guy who will stick around through that toddler period.
So he's simply doing what evolution mandates
. Your job is to be patient with him