I sexed my robos in store, the girl just wasn't holding them right while double checking.
I new more about hamsters than her, which was fun. Though there was a couple behind me that was talking about how they killed one of the hams (by accident) but just laughed at it for ages. the store didn't seem to mind.
though I did have one problem tha lady who pack my bag (when there was needed two or three bags) bent my book in half.