Why wont my two female leopard geckos breed with my male?

I have decided to breed my two 1 year old female leopard geckos who each weigh 65g and 68g. They're healthy and fat as well, so i bought a 2 year old male who weighs 73g aswell as a vivarium stack, all the equipment and an incubator. Basically i'm all set to go and breeding season has begun yet when i introduced him into their viv (which has plenty of space) he keeps being rejected. He rattles his tail and starts to nibble them but they just refuse him, why??? I thought they werent 'fussy' Any ideas??