Aside from the basic problems of having two animals living in the same cage (not always the best idea), are they both of breeding size (I gather they are - or are close)?
It is likely that the male (if he is ready) will try to breed the female if you put them together. This could cause a vareity of issues with both animals, especailly if the female is not quite there yet.
Also from what I gather - males breed better if they are placed with the female only for breeding and then removed - I guess the familiarity might throw off the natural attraction (better known as old married couple syndrome). This might be something to consider if you want to seriously breed them later in the year.
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Tosha 
"Nihil facimus sed id bene facimus"

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