Differentiating male and female hamster genital

How to distinguish the sex of the hamster is located at a distance between the anus and cock. If the type of female hamsters almost seemed no distance / meetings between the anus and cock. While the male species has a greater distance between the anus and cock. In addition to Campbell's kind of adult hamsters, there will be a yellow oily liquid that comes out from its center position. For more details, see the following picture:

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