Male or not?

Question
I adopted 2 cats around Christmas time from a shelter.  The shelter told me both cats were female with the older one already spayed.  Well it seems to me that the younger one, just over a year old, appears to be a male.  How can I tell for sure?  It has, for lack of a better word, what looks like small balls unders it's tail beneath it's butt hole.  Is this a male cat?

Answer
Lori,

Yes, it sounds as if it could be.  However, truthfully, without pictures, it is hard to tell just from a description.  To be absolutely sure, next time you go to the vet, have the vet check the cat to see if it is a male or a female.  

However, once they are neutered or spayed, it really should not make any difference.

If it does turn out to be a male, it soiunds as if your shelter needs a lesson in basic external feline anatomy.

Best regards... Norm.