Yep--typical behavior for two birds together--there is nothing wrong with them!! You can tell a female-almost--by its behavior--they are nippier , grouchier, and bossier than the males--at least its one way to make a better guess! As you have found out it takes time to prove the theory.

If you are talking about potty training keets--its easier to carry around a kleenex and wipe up after them--in my opinion--but I am sure somebody will be along to tell you about potty training them.      Katz

I don't know if this works for budgies but I had a tiel that I did train to go potty in one spot.  Unfortunely not in the cage but on the floor with was easier they the carpet.  With tiels they back up when they are going to go.  So when my tiel did I said no and took it to the floor.  Before long the tiel would only go on the floor.  Not even in the cage.  I always closed the door at night, but during the day it had free range of the house.  So you can just image how eager it was to get out in the morning. 

Birdlady, if you potty train birds in the future, don't use the word *No* to stop the action--they understand *no*, and associate with behaviors they should not be doing.  You aren't trying to keep the bird from pooping entirely, just to teach it to go on command and in a location you choose.  I use the word *wait* when I see them getting ready--it is just enough to distract them, then I move them to a good spot and say *Ok, go potty*.   As you discovered, they can be quickly trained, and sometimes over-trained, to the extent that they will not go anywhere unless they are told to.  That can actually be dangerous to them to be trained so well.

1GoodBird.  Thanks for the information.  I was lucky that my tiel didn't get sick.  With Lily I will keep that in mind.