There is a possibility of transferring fecal bacteria to the vagina, and creating a rather nasty infection. Obviously, the risk with contact outside the anus is much less than with contact inside the anus, but it is still greater than zero. I don't think there's a way to put a number of the degree of risk, since there are so many factors involved that would vary by the individual. This would include recency of last bowel movement and general hygeine. The risk would be very close to zero if the area was washed with soap before the activity and there was no penetration of the anus.
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