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Using the Sybian or VX1 is NOT advised if you are or are attempting to become pregnant.  For obvious reasons it has not been tested under these conditions (wouldn't want to shake anybody loose from their grip!).  

Also Sybian and VX1 have not been tested (nor are they approved) for use by Intrauterine Device (IUD), diaphragm, or cervical cap wearers.  If a woman has been diagnosed as having a collapsed or inverted uterus do not use Sybian or VX1.  If you have any questions or doubts see a Gynecologist familiar with adult toys, or open to discussing lifestyle innovations, and please refer him or her to this site.