might i suggest getting a plug with a harness attached, it wears like a thong except has a plug attached, that way it will stay in your anus because well it hasta. im sure someone can give you a link for one, i dont wanna go dig one up
I've had the nonskid one, it wasn't fun and still fell out. You might want to try a different shaped base. I find that the metal Meteor plugs rock. The flare of the handle is very narrow so it sits nicely in the ass crack. Metal sounds a little scary at first, but they're actually quite comfortable. http://www.goodvibes.com/Item--i-14BF57--m-16