I want to say a vibrating plug. My husband and I have always used the regular glass plugs but we recently recieved a vibrating butt plug from my roommate at our wedding and we cannot stop using it. I'll have to buy another since we practically fight over it. Offers a very unique feeling during sex.
Vibrating plugs. In the past I made my own anal beads. Just taking out the supplies got my juices flowing. Somehow they lost their appeal and now I have both sets with fresh strings waiting more than a year for use. I haven't tried beaded probes and I think they could jump to the top of my list. They provide more sphincter stimulation than plain dildos but they're gentler than beads.