Tom Cat won’t breed with in-season queen!??

I recently got a Queen to breed with my 3 year old tom cat. He is an
exceptional little guy in great health and I have guarenteed homes for
up to 7 kittens (just so you know im responsible!) 

He often calls for a mate...howls etc whatever you like to call it,
yet now the queen is in season he is showing no interest at all. He is
very placid and seems almost worried or frightened when she squats in
front of him  waggling her tail and growling excitedly. She has hissed
and smacked him in the past, could this have frightened him off?

I cant understand his complete lack of interest in mating, is it just
because he is inexperienced, or does this suggest it is a lost cause? 

Also is there anything at all I can do?

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