Me and my girlfriend enjoy using anal beads both as a sex enhancement but sometimes as foreplay before anal sex. I've used a couple myself with mixed results but still enjoyable. Our favorite is the Flexi Felix
anal beads due to their all silicone construction, smooth texture, and easy sizes to insert. We typically use the Flexi Felix at the same time as we have sex, which adds a bit for both of us as I can feel them while I'm inside her as well.
We recently were asked to review a set of vibrating anal beads for EF, and these definitely were interesting to try for both of us. Mixed feelings about the texture; however, girlfriend likes the vibrating aspect of the beads.