Anal beads are available in various sizes. We also offer vibrating anal beads. Some people — especially beginners — use smaller beads at first. Others find that larger beads heighten the level of arousal and intensity. Since the outer sphincter of the anus has many nerve endings, the sensations produced by the movement of anal beads can cause intense arousal. Once inside, the inner sphincter responds to pressure that the beads — depending on the size — may create.