The reasons why you should always quarantine incoming snakes is because that incoming snake could have RI (respiratory infection), IBD (inclusion body disease), internal/external parasites (worms/mites, ticks, fleas, etc.), scale rot, mouth rot, and things such as that. First, check both snakes for any of the things I listed. If you aren't sure what some are, like RI or IBD, research them then after you know what it is check the snake for any symptoms. If you notice no signs of external parasites or sickness, keep a very close eye on both snakes. Keep a close eye on them for the next few weeks to make sure your female hasn't caught anything and the male doesn't have anything. Hopefully both snakes are healthy and doing well.

Also, since you have two different sexes in the same enclosure, there could possibly be mating involved. If you aren't ready for eggs, and your female isn't the correct weight to produce eggs, keep the male in a plastic container. Breeding is a problem with most snakes when both sexes are put in the same enclosure, that is if you and your female are not ready.