Why wont my hamsters mate?

I have 1 male and 1 female and adjectives my male seems to do is lick her privates and clean her kinda, and bite her side. And is she supposed to smell, her privates?

Answers:    maybee they dnt approaching each other (: haha x
try keeping them together a bit longer and see what happens also remember that they have fry cycles and if not "in heat" will not breed but just preserve trying maby once every two days untill he mates also if they are under 4-5 months weak they are only babies and will not mate with each other
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