NO NEED at all.....never rolled them???? Thats what I call it, 100% accurate......just firml;y but gently run yuor fingers over the bottom of the tail till you feel two bumps 1/3-1/2 the way down from vent to the tail....if you feel two bumps, a boy, if not ry again to make sure, and a girl.....no need to pop or probe baby boas....

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