ROS is considered an acronym for Real Oral Sex, Real Oral Structure, Realistic Oral Sex, Replication or Restoration of Oral Structure! Starpery Doll, Zelex Doll, Yeloly Doll, and some of the head models feature ROS. ROS is an upgraded version of the silicone doll that includes a super soft silicone openable mouth and a fully movable jaw! The mouth has super soft silicone teeth and a realistic movable tongue, and a textured palate on the entire mouth chamber. The ultra-realistic silicone head is finally here, ready for ultra-realistic oral sex. Say goodbye to bulging eyes, and hello to the best oral sex you've ever had.