Not necessarily.
They will sometimes do it around other males. You would have to probe or pop the other one to be sure.
This is funny though because it's actually exactly how I discovered my first ball was a female. She was actually presenting to my small male while I was trying to take pictures of them and I totally thought she was trying to poop on him. I freaked out and grabbed him away from her and she kept moving and doing a little tail wagging dance. So I looked it up and was very relieved. Lol

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