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In a nutshell, BTS are virtually impossible to sex when adults. I don't even know if you can probe them. The general consensus I've heard is: if it has babies, its a female!
Males sometimes leave sperm plugs around their cage, and if you knwo what to look for (a small mucousy glob), you may be able to single out a male.
Beyond that, try putting a pair together and watch them closely. If they don't start fighting, you may have one of each on your hands. Continue to observe diligently.
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