Well, to begin...if you ARE thinking about permanently housing them together...you should NOT. During breeding season, if you prep her and she's sexually mature, then sure, introduce him to her. But they should not be housed together for a plethora of reasons ranging from health to behavior issues. Snakes are solitary creatures, and ideally should have their own enclosures.

Also, if you bring in a new female, you will need to quarantine her in a separate room from all the others to make sure she doesn't bring anything into your collection. Another reason housing them together is a no no. If one gets sick, the other could get it. They could possibly fight over different locations in the cage for temperature regulation. And those are only a few of the reasons it's not a good idea. I'm sure others will come in with more.

Basically what I'm saying here is...don't buy the female unless you already have an enclosure for her that will be all her own that you can keep her separate from your collection in, and can afford to accommodate her much larger adult size. An adult female gets much larger than an adult male. You probably already know this, but it's just something to keep in mind when you consider buying a female.