Mine stays in place, as it has a nice taper to it....meaning it has a nice bulge that gets inserted and rests inside next to my prostrate, but narrows down nicely at my anus....with two nice bulges that sit and rest outside my anus...... so yes it stays inserted once in. I tend to insert the device, and then sit on it on my bed.......and then just "grind away" while sitting......uses a remote control to cause it to vibrate.......and oh man.......gets me squirming, shaking, leaking and moaning in minutes.....allows me to squeeze and play with my nipples, which just adds to the pleasure..........I love it.....